/*-------------------------------------------------------------------------
 |   RXTX License v 2.1 - LGPL v 2.1 + Linking Over Controlled Interface.
 |   RXTX is a native interface to serial ports in java.
 |   Copyright 1997-2009 by Trent Jarvi tjarvi@qbang.org and others who
 |   actually wrote it.  See individual source files for more information.
 |
 |   A copy of the LGPL v 2.1 may be found at
 |   http://www.gnu.org/licenses/lgpl.txt on March 4th 2007.  A copy is
 |   here for your convenience.
 |
 |   This library is free software; you can redistribute it and/or
 |   modify it under the terms of the GNU Lesser General Public
 |   License as published by the Free Software Foundation; either
 |   version 2.1 of the License, or (at your option) any later version.
 |
 |   This library is distributed in the hope that it will be useful,
 |   but WITHOUT ANY WARRANTY; without even the implied warranty of
 |   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 |   Lesser General Public License for more details.
 |
 |   An executable that contains no derivative of any portion of RXTX, but
 |   is designed to work with RXTX by being dynamically linked with it,
 |   is considered a "work that uses the Library" subject to the terms and
 |   conditions of the GNU Lesser General Public License.
 |
 |   The following has been added to the RXTX License to remove
 |   any confusion about linking to RXTX.   We want to allow in part what
 |   section 5, paragraph 2 of the LGPL does not permit in the special
 |   case of linking over a controlled interface.  The intent is to add a
 |   Java Specification Request or standards body defined interface in the
 |   future as another exception but one is not currently available.
 |
 |   http://www.fsf.org/licenses/gpl-faq.html#LinkingOverControlledInterface
 |
 |   As a special exception, the copyright holders of RXTX give you
 |   permission to link RXTX with independent modules that communicate with
 |   RXTX solely through the Sun Microsytems CommAPI interface version 2,
 |   regardless of the license terms of these independent modules, and to copy
 |   and distribute the resulting combined work under terms of your choice,
 |   provided that every copy of the combined work is accompanied by a complete
 |   copy of the source code of RXTX (the version of RXTX used to produce the
 |   combined work), being distributed under the terms of the GNU Lesser General
 |   Public License plus this exception.  An independent module is a
 |   module which is not derived from or based on RXTX.
 |
 |   Note that people who make modified versions of RXTX are not obligated
 |   to grant this special exception for their modified versions; it is
 |   their choice whether to do so.  The GNU Lesser General Public License
 |   gives permission to release a modified version without this exception; this
 |   exception also makes it possible to release a modified version which
 |   carries forward this exception.
 |
 |   You should have received a copy of the GNU Lesser General Public
 |   License along with this library; if not, write to the Free
 |   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 |   All trademarks belong to their respective owners.
 --------------------------------------------------------------------------*/
#if defined(__MWERKS__) /* dima */
#include "RXTXPort.h" /* dima */
#else  /* dima */
#ifndef WIN32
#	include "config.h"
#endif
#include "include/gnu_io_RXTXPort.h"
#endif /* dima */
#ifdef __LCC__ /* windows lcc compiler for fd_set. probably wrong */
#   include<winsock.h>
#endif /* __LCC__ */
#include <time.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/stat.h>
#ifndef WIN32
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/utsname.h>
#include <pthread.h>
#else
#	include "win32termios.h"
/*  FIXME  returns 0 in all cases on win32
 #define S_ISCHR(m)	(((m)&S_IFMT) == S_IFCHR)
 */
#	if !defined(S_ISCHR)
#		define S_ISCHR(m) (1)
#	endif /* S_ISCHR(m) */
#endif /* WIN32 */
#ifdef HAVE_TERMIOS_H
#	include <termios.h>
#endif /* HAVE_TERMIOS_H */
#   include <signal.h>
#ifdef HAVE_SIGNAL_H
#   include <signal.h>
#endif /* HAVE_SIGNAL_H */
#ifdef HAVE_SYS_SIGNAL_H
#   include <sys/signal.h>
#endif /* HAVE_SYS_SIGNAL_H */
#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#   include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
#   include <fcntl.h>
#ifdef HAVE_SYS_FCNTL_H
#   include <sys/fcntl.h>
#endif /* HAVE_SYS_FCNTL_H */
#ifdef HAVE_SYS_FILE_H
#   include <sys/file.h>
#endif /* HAVE_SYS_FILE_H */
#ifdef LFS  /* File Lock Server */
#	include <sys/socket.h>
#	include <netinet/in.h>
#	include <arpa/inet.h>
#endif /* FLS */
#if defined(__linux__)
#	include <linux/types.h> /* fix for linux-2.3.4? kernels */
#	include <linux/serial.h>
#	include <linux/version.h>
#endif /* __linux__ */
#if defined(__sun__)
#	include <sys/filio.h>
#	include <sys/mkdev.h>
#endif /* __sun__ */
#if defined(__hpux__)
#	include <sys/modem.h>
#endif /* __hpux__ */
/* FIXME -- new file */
#if defined(__APPLE__)
#	include <CoreFoundation/CoreFoundation.h>
#	include <IOKit/IOKitLib.h>
#	include <IOKit/serial/IOSerialKeys.h>
#	include <IOKit/IOBSD.h>
#endif /* __APPLE__ */
#ifdef __unixware__
#	include  <sys/filio.h>
#endif /* __unixware__ */
#ifdef HAVE_PWD_H
#include	<pwd.h>
#endif /* HAVE_PWD_H */
#ifdef HAVE_GRP_H
#include 	<grp.h>
#endif /* HAVE_GRP_H */
#include <math.h>
#ifdef LIBLOCKDEV
#include	<lockdev.h>
#endif /* LIBLOCKDEV */

extern int errno;

#include "SerialImp.h"

JavaVM *javaVM = NULL;

struct preopened *preopened_port = NULL;

/* this is so diff will not generate noise when merging 1.4 and 1.5 changes
 * It will eventually be removed.
 * */
#define RXTXPort(foo) Java_gnu_io_RXTXPort_ ## foo
#define RXTXVersion(foo) Java_gnu_io_RXTXVersion_ ## foo
#define RXTXCommDriver(foo) Java_gnu_io_RXTXCommDriver_ ## foo

#if defined(__sun__) || defined(__hpux__)
/*----------------------------------------------------------
 cfmakeraw

 accept:      termios to be set to raw
 perform:     initializes the termios structure.
 return:      int 0 on success
 exceptions:  none
 comments:    this is how linux cfmakeraw works.
 termios(3) manpage
 ----------------------------------------------------------*/

int cfmakeraw ( struct termios *term )
{
	ENTER( "cfmakeraw" );
	term->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
	term->c_oflag &= ~OPOST;
	term->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
	term->c_cflag &= ~(CSIZE|PARENB);
	term->c_cflag |= CS8;
	LEAVE( "cfmakeraw" );
	return( 0 );
}
#endif /* __sun__  || __hpux__ */

#ifdef DEBUG_TIMING
struct timeval snow, enow, seloop, eeloop;
#define report_time_eventLoop( ) { \
	if ( seloop.tv_sec == eeloop.tv_sec && seloop.tv_usec == eeloop.tv_usec ) \
	{ \
		gettimeofday(&eeloop, NULL); \
		seloop.tv_sec = eeloop.tv_sec; \
		seloop.tv_usec = eeloop.tv_usec; \
		printf("%8i sec : %8i usec\n", eeloop.tv_sec - seloop.tv_sec, eeloop.tv_usec - seloop.tv_usec); \
	} \
}
#define report_time( ) \
{ \
	struct timeval now; \
	gettimeofday(&now, NULL); \
	mexPrintf("%8s : %5i : %8i sec : %8i usec\n", __TIME__, __LINE__, now.tv_sec, now.tv_usec); \
}
#define report_time_start( ) \
{ \
	gettimeofday(&snow, NULL); \
	mexPrintf("%8s : %5i : %8i sec : %8i usec", __TIME__, __LINE__, snow.tv_sec, snow.tv_usec); \
}
#define report_time_end( ) \
{ \
	gettimeofday(&enow, NULL); \
	mexPrintf("%8i sec : %8i usec\n", enow.tv_sec - snow.tv_sec, enow.tv_sec - snow.tv_sec?snow.tv_usec-enow.tv_usec:enow.tv_usec - snow.tv_usec); \
}
#else
#define report_time_eventLoop( ){};
#define report_time( ) {}
#define report_time_start( ) {}
#define report_time_end( ) {}
#endif /* DEBUG_TIMING */

struct event_info_struct *master_index = NULL;

/*----------------------------------------------------------
 RXTXPort.Initialize

 accept:      The JNIEnv and jobj of the thread, the original eis.
 perform:     fill in the needed variables with this threads values
 return:      none
 exceptions:  none
 comments:    java variables (especially JNIEnv) should not be shared
 between threads.  Right now we build a local struct with
 the thread's info before using the variabls.  This is
 especially true for send_event.

 See also JNI_OnLoad() if the thread does not have the values
 ----------------------------------------------------------*/
struct event_info_struct build_threadsafe_eis(JNIEnv *env, jobject *jobj,
		struct event_info_struct *eis) {
	struct event_info_struct myeis = *eis;

	myeis.env = env;
	myeis.jclazz = (*env)->GetObjectClass(env, *jobj);
	myeis.jobj = jobj;
	myeis.fd = get_java_var(env, *jobj, "fd", "I");
	myeis.send_event = (*env)->GetMethodID(env, myeis.jclazz, "sendEvent",
			"(IZ)Z");
	return (myeis);
}

/*----------------------------------------------------------
 RXTXPort.Initialize

 accept:      none
 perform:     Initialize the native library
 return:      none
 exceptions:  none
 comments:    Basically this just causes rxtx to ignore signals.  signal
 handlers where tried but the VM (circa 1.1) did not like it.

 It also allows for some sanity checks on linux boxes if DEBUG
 is enabled.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(Initialize)(
	JNIEnv *env,
	jclass jclazz
	)
{
#if defined DEBUG && defined(__linux__)
	struct utsname name;
	char message[80];
#endif /* DEBUG && __linux__ */
	/* This bit of code checks to see if there is a signal handler installed
	   for SIGIO, and installs SIG_IGN if there is not.  This is necessary
	   for the native threads jdk, but we don't want to do it with green
	   threads, because it slows things down.  Go figure. */

	/* POSIX signal handling functions */
#if !defined(WIN32)
	struct sigaction old_action;
	sigaction(SIGIO, NULL, &old_action);
	/* green threads already has handler, no touch */
	if (old_action.sa_handler == NULL) {
		/* no handler when using native threads, set to ignore */
		struct sigaction new_action;
		sigset_t block_mask;
		sigemptyset(&block_mask);
		new_action.sa_handler = SIG_IGN;
#ifdef SA_RESTART
		new_action.sa_flags = SA_RESTART;
#endif /* SA_RESTART */
		new_action.sa_mask = block_mask;
		sigaction(SIGIO, &new_action, NULL);
	}
#endif /* !WIN32 */
	ENTER("RXTXPort:Initialize");
#ifdef PRERELEASE
/*  this is just for avoiding confusion while testing new libraries */
#ifdef DEBUG_MW
mexPrintf("RXTX Prerelease for testing  Tue Feb 19 18:00:27 EST 2002\n");
#else
printf("RXTX Prerelease for testing  Thu Feb 21 19:31:38\n");
#endif /* DEBUG_MW */
#endif /* PRERELEASE */
#if DEBUG_TIMING
gettimeofday(&seloop, NULL);
#endif /* DEBUG_TIMING */
#if defined(DEBUG) && defined(__linux__)
/* Lets let people who upgraded kernels know they may have problems */
/*
 if (uname (&name) == -1)
 {
 report( "RXTX WARNING:  cannot get system name\n" );
 LEAVE( "RXTXPort:Initialize" );
 return;
 }
 if(strcmp(name.release,UTS_RELEASE)!=0)
 {
 sprintf( message, LINUX_KERNEL_VERSION_ERROR, UTS_RELEASE,
 name.release );
 report( message );
 getchar();
 }
 */
LEAVE( "RXTXPort:Initialize" );
#endif /* DEBUG && __linux__ */
}

/*----------------------------------------------------------
 RXTXPort.find_preopened_ports
 accept:      The device to find if preopened.  ie "/dev/ttyS0"
 perform:     find the filedescriptor if preopened
 return:      fd
 exceptions:  none
 comments:    see
 RXTXPort.nativeStaticSetDSR
 RXTXPort.nativeStaticSetDTR
 RXTXPort.nativeStaticSetRTS
 RXTXPort.nativeStaticSetSerialPortParams
 This is used so people can setDTR low before calling the
 Java open().
 ----------------------------------------------------------*/
int find_preopened_ports(const char *filename) {
int fd;
struct preopened *p = preopened_port;

if (!p) {
	return (0);
}
for (;;) {
	if (!strcmp(p->filename, filename)) {
		fd = p->fd;
		if (p->prev && p->next) {
			p->prev->next = p->next;
			p->next->prev = p->prev;
		} else if (p->prev) {
			p->prev->next = NULL;
		} else if (p->next) {
			p->next->prev = NULL;
		} else {
			free(p);
			preopened_port = NULL;
			return (fd);
		}
		free(p);
		return (fd);
	}
	if (p->next) {
		p = p->next;
	} else {
		return (0);
	}
}
}

/*----------------------------------------------------------
 configure_port

 accept:      env, file descriptor
 perform:     set the termios struct to sane settings and
 return:      0 on success
 exceptions:  IOExcepiton
 comments:    Very often people complain about not being able to get past
 this function and it turns out to be permissions on the
 device file or bios has the device disabled.
 ----------------------------------------------------------*/
int configure_port(int fd) {
struct termios ttyset;

if (fd < 0)
	goto fail;

if (tcgetattr(fd, &ttyset) < 0)
	goto fail;
ttyset.c_iflag = INPCK;
ttyset.c_lflag = 0;
ttyset.c_oflag = 0;
ttyset.c_cflag = CREAD | CS8 | CLOCAL;
ttyset.c_cc[ VMIN] = 0;
ttyset.c_cc[ VTIME] = 0;

#ifdef __FreeBSD_kernel__
if( cfsetspeed( &ttyset, B9600 ) < 0 ) goto fail;
#else
if (cfsetispeed(&ttyset, B9600) < 0)
	goto fail;
if (cfsetospeed(&ttyset, B9600) < 0)
	goto fail;
#endif
if (tcsetattr(fd, TCSANOW, &ttyset) < 0)
	goto fail;
#ifndef WIN32
fcntl(fd, F_SETOWN, getpid());
#endif /* WIN32 */
#ifdef FASYNC
fcntl(fd, F_SETFL, FASYNC);
#endif /* FASYNC */

return 0;

fail: return 1;
}

/*----------------------------------------------------------
 get_java_baudrate

 accept:      the native speed setting
 perform:     translate the native speed to a Java speed
 return:      the Java speed
 exceptions:  none
 comments:    This is used by open() (indirectly) and
 nativeStaticGetBaudRate()
 ----------------------------------------------------------*/
int get_java_baudrate(int native_speed) {
switch (native_speed) {
case B0:
	return 0;
case B50:
	return 50;
case B75:
	return 75;
case B110:
	return 110;
case B134:
	return 134;
case B150:
	return 150;
case B200:
	return 200;
case B300:
	return 300;
case B600:
	return 600;
case B1200:
	return 1200;
case B1800:
	return 1800;
case B2400:
	return 2400;
case B4800:
	return 4800;
case B9600:
	return 9600;
#ifdef B14400
	case B14400: return 14400;
#endif /* B14400 */
case B19200:
	return 19200;
#ifdef B28800
	case B28800: return 28800;
#endif /* B28800 */
case B38400:
	return 38400;
case B57600:
	return 57600;
	/* I don't think this is universal.. older UARTs never did these.  taj */
#ifdef B115200
case B115200:
	return 115200;
#endif /*  B115200 */
#ifdef B128000  /* dima */
	case B128000: return 128000;
#endif  /* dima */
#ifdef B230400
case B230400:
	return 230400;
#endif /* B230400 */
#ifdef B256000  /* dima */
	case B256000: return 256000;
#endif  /* dima */
#ifdef B460800
case B460800:
	return 460800;
#endif /* B460800 */
#ifdef B500000
case B500000:
	return 500000;
#endif /* B500000 */
#ifdef B576000
case B576000:
	return 576000;
#endif /* B576000 */
#ifdef B921600
case B921600:
	return 921600;
#endif /* B921600 */
#ifdef B1000000
case B1000000:
	return 1000000;
#endif /* B1000000 */
#ifdef B1152000
case B1152000:
	return 1152000;
#endif /* B1152000 */
#ifdef B1500000
case B1500000:
	return 1500000;
#endif /* B1500000 */
#ifdef B2000000
case B2000000:
	return 2000000;
#endif /* B2000000 */
#ifdef B2500000
case B2500000:
	return 2500000;
#endif /* B2500000 */
#ifdef B3000000
case B3000000:
	return 3000000;
#endif /* B3000000 */
#ifdef B3500000
case B3500000:
	return 3500000;
#endif /* B3500000 */
#ifdef B4000000
case B4000000:
	return 4000000;
#endif /* B4000000 */
default:
	return -1;
}
}

/*----------------------------------------------------------
 set_java_vars

 accept:      fd of the preopened device
 perform:     Now that the object is instatiated, set the Java variables
 to the preopened states.
 return:      none
 exceptions:  none
 comments:    preopened refers to the fact that the serial port has
 been configured before the Java open() has been called.
 ----------------------------------------------------------*/

void set_java_vars(JNIEnv *env, jobject jobj, int fd) {
struct termios ttyset;
int databits = -1;
int jparity = -1;
int stop_bits = STOPBITS_1_5;
int baudrate;
jclass jclazz = (*env)->GetObjectClass(env, jobj);
jfieldID jfspeed = (*env)->GetFieldID(env, jclazz, "speed", "I");
jfieldID jfdataBits = (*env)->GetFieldID(env, jclazz, "dataBits", "I");
jfieldID jfstopBits = (*env)->GetFieldID(env, jclazz, "stopBits", "I");
jfieldID jfparity = (*env)->GetFieldID(env, jclazz, "parity", "I");
(*env)->DeleteLocalRef(env, jclazz);
if (tcgetattr(fd, &ttyset) < 0) {
	report("Cannot Get Serial Port Settings\n");
	(*env)->DeleteLocalRef(env, jclazz);
	return;
}

switch (ttyset.c_cflag & CSIZE) {
case CS5:
	databits = JDATABITS_5;
	break;
case CS6:
	databits = JDATABITS_6;
	break;
case CS7:
	databits = JDATABITS_7;
	break;
case CS8:
	databits = JDATABITS_8;
	break;
}
#ifdef CMSPAR
switch (ttyset.c_cflag & (PARENB | PARODD | CMSPAR)) {
#else
switch( ttyset.c_cflag&(PARENB|PARODD) ) {
#endif /* CMSPAR */
case 0:
	jparity = JPARITY_NONE;
	break;
case PARENB:
	jparity = JPARITY_EVEN;
	break;
case PARENB | PARODD:
	jparity = JPARITY_ODD;
	break;
#ifdef CMSPAR
case PARENB | PARODD | CMSPAR:
	jparity = JPARITY_MARK;
	break;
case PARENB | CMSPAR:
	jparity = JPARITY_SPACE;
	break;
#endif /* CMSPAR */
}
switch (ttyset.c_cflag & (CSTOPB)) {
case 0:
	stop_bits = STOPBITS_1;
	break;
case CSTOPB:
	if ((ttyset.c_cflag & CSIZE) == CS5) {
		stop_bits = STOPBITS_1_5;
	} else {
		stop_bits = STOPBITS_2;
	}
	break;
}
/*
 dima writes:

 Trent, here is something I found with google:
 (freebsd list freebsd-current@freebsd.org)

 Andrzej Bialecki <abial@korin.warman.org.pl> asked:
 I tried to compile a piece of software, probably for Linux, and I noticed
 that we don't define CBAUD constant. I'm not sure, but I think POSIX
 defines and uses it. Should(n't) we?

 Bruce Evans <bde@zeta.org.au> answered:
 CBAUD is for SYSV compatibility.  It is considerably inferior to POSIX's
 cf{get,set}{i,o}speed and shouldn't be provided or used.

 */
#if defined(CBAUD)/* dima */
baudrate = ttyset.c_cflag & CBAUD;
#else
baudrate = cfgetispeed(&ttyset);
#endif
(*env)->SetIntField(env, jobj, jfspeed, (jint) get_java_baudrate(baudrate));
(*env)->SetIntField(env, jobj, jfdataBits, (jint) databits);
(*env)->SetIntField(env, jobj, jfstopBits, (jint) stop_bits);
(*env)->SetIntField(env, jobj, jfparity, (jint) jparity);
}
/*----------------------------------------------------------
 RXTXPort.open

 accept:      The device to open.  ie "/dev/ttyS0"
 perform:     open the device, set the termios struct to sane settings and
 return the filedescriptor
 return:      fd
 exceptions:  IOExcepiton
 comments:    Very often people complain about not being able to get past
 this function and it turns out to be permissions on the
 device file or bios has the device disabled.
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(open)(JNIEnv *env, jobject jobj, jstring jstr) {
int fd;
int pid = -1;
char message[80];
const char *filename;
jclass jclazz = (*env)->GetObjectClass(env, jobj);
jfieldID jfid = (*env)->GetFieldID(env, jclazz, "pid", "I");
report_time_start( );

if (!jfid) {
	(*env)->ExceptionDescribe(env);
	(*env)->ExceptionClear(env);
	(*env)->DeleteLocalRef(env, jclazz);
	return -1;
}

#ifndef WIN32
pid = getpid();
#endif /* WIN32 */

(*env)->SetIntField(env, jobj, jfid, (jint) pid);
(*env)->DeleteLocalRef(env, jclazz);

filename = (*env)->GetStringUTFChars(env, jstr, 0);

/*
 LOCK is one of three functions defined in SerialImp.h

 uucp_lock		Solaris
 fhs_lock		Linux
 system_does_not_lock	Win32
 */

ENTER( "RXTXPort:open" );
if ( LOCK(filename, pid)) {
	sprintf(message, "open: locking has failed for %s\n", filename);
	report(message);
	goto fail;
} else {
	sprintf(message, "open: locking worked for %s\n", filename);
	report(message);
}
/* This is used so DTR can remain low on 'open()' */
fd = find_preopened_ports(filename);
if (fd) {
	set_java_vars(env, jobj, fd);
	(*env)->ReleaseStringUTFChars(env, jstr, filename);
	return (jint) fd;
}

do {
	fd = OPEN(filename, O_RDWR | O_NOCTTY | O_NONBLOCK);
} while (fd < 0 && errno == EINTR);

#ifdef OPEN_EXCL
/*
 Note that open() follows POSIX semantics: multiple open() calls to
 the same file will succeed unless the TIOCEXCL ioctl is issued.
 This will prevent additional opens except by root-owned processes.
 See tty(4) ("man 4 tty") and ioctl(2) ("man 2 ioctl") for details.
 */

if (fd >= 0 && (ioctl(fd, TIOCEXCL) == -1))
{
	sprintf( message, "open: exclusive access denied for %s\n",
			filename );
	report( message );
	report_error( message );

	close(fd);
	goto fail;
}
#endif /* OPEN_EXCL */

if (configure_port(fd))
	goto fail;
(*env)->ReleaseStringUTFChars(env, jstr, filename);
sprintf(message, "open: fd returned is %i\n", fd);
report(message);
LEAVE( "RXTXPort:open" );
report_time_end( );
return (jint) fd;

fail: (*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:open" );
throw_java_exception(env, PORT_IN_USE_EXCEPTION, "open", strerror( errno));
return -1;
}

/*----------------------------------------------------------
 RXTXPort.nativeClose

 accept:      none
 perform:     get the fd from the java end and close it
 return:      none
 exceptions:  none
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(nativeClose)( JNIEnv *env,
	jobject jobj,jstring jstr )
{
	int result, pid;
	int fd = get_java_var( env, jobj,"fd","I" );
	const char *filename = (*env)->GetStringUTFChars( env, jstr, 0 );
	jclass jclazz = (*env)->GetObjectClass( env, jobj );
	report_time_start( );
	pid = get_java_var( env, jobj,"pid","I" );

	report(">nativeClose pid\n");
	/*
	usleep(10000);
	*/
	if( !pid ) {
		(*env)->ExceptionDescribe( env );
		(*env)->ExceptionClear( env );
		(*env)->DeleteLocalRef( env, jclazz );
		report("nativeClose: Close not detecting thread pid");
		return;
	}
	report("<nativeClose: pid\n");

	/*
		UNLOCK is one of three functions defined in SerialImp.h

			uucp_unlock		Solaris
			fhs_unlock		Linux
			system_does_not_unlock	Win32
	*/

	ENTER("RXTXPort:nativeClose");if (fd > 0)
	{
		report("nativeClose: discarding remaining data (tcflush)\n");
		/* discard any incoming+outgoing data not yet read/sent */
		tcflush(fd, TCIOFLUSH);
 		do {
			report("nativeClose:  calling close\n");
			result=CLOSE (fd);
		}  while ( result < 0 && errno == EINTR );
		UNLOCK( filename, pid );
	}
	report("nativeClose: Delete jclazz\n");
	(*env)->DeleteLocalRef( env, jclazz );
	report("nativeClose: release filename\n");
	(*env)->ReleaseStringUTFChars( env, jstr, filename );
	LEAVE(
	"RXTXPort:nativeClose"); report_time_end( );
return;
}

/*----------------------------------------------------------
 RXTXPort.set_port_params

 accept:     env, fd, speed, data bits, stop bits, parity
 perform:    set the serial port parameters
 return:     1 on error
 exceptions: UnsupportedCommOperationException
 comments:   There is a static method and an instance method that use this
 function.  The static method gets a fd first.  The instance
 method can get the fd from the object.

 see:  nativeSetSerialPortParams & nativeStaticSerialPortParams
 ----------------------------------------------------------*/
int set_port_params(JNIEnv *env, int fd, int cspeed, int dataBits, int stopBits,
int parity) {
struct termios ttyset;
int result = 0;
#if defined(TIOCGSERIAL)
struct serial_struct sstruct;
#endif /* TIOCGSERIAL */

if (tcgetattr(fd, &ttyset) < 0) {
report("set_port_params: Cannot Get Serial Port Settings\n");
return (1);
}

if (translate_data_bits(env, &(ttyset.c_cflag), dataBits)) {
report("set_port_params: Invalid Data Bits Selected\n");
return (1);
}

if (translate_stop_bits(env, &(ttyset.c_cflag), stopBits)) {
report("set_port_params: Invalid Stop Bits Selected\n");
return (1);
}

if (translate_parity(env, &(ttyset.c_cflag), parity)) {
report("set_port_params: Invalid Parity Selected\n");
return (1);
}

#ifdef __FreeBSD_kernel__
if( cfsetspeed( &ttyset, cspeed ) < 0 )
{
report( "set_port_params: Cannot Set Speed\n" );
return( 1 );
}
#endif  /* __FreeBSD_kernel__ */
if (!cspeed) {
/* hang up the modem aka drop DTR  */
/* Unix should handle this */
/*
 mexPrintf("dropping DTR\n");
 printf("dropping DTR\n");
 */
ioctl(fd, TIOCMGET, &result);
result &= ~TIOCM_DTR;
ioctl(fd, TIOCMSET, &result);
}
/*
 B38400 is a special case in Linux for custom baud rates.

 We just treat this as a custom speed for now.  If you take this ifdef
 out and select baud rates 38400 then 28800 then 38400, you will get
 a final baud rate of 28800 because you did not update the divisor.

 However, if the serial port doesn't support TIOCGSERIAL or custom speeds,
 don't fail: In this case, just use B38400 and assume that there is no way
 to set a custom speed on this port.

 See the next ifdef below for the divisor.
 */
#if defined(TIOCGSERIAL)
if (cspeed == B38400 && ioctl(fd, TIOCGSERIAL, &sstruct) == 0)
cspeed = 38400;
#endif /* TIOCGSERIAL */
if (cfsetispeed(&ttyset, cspeed) < 0 || cfsetospeed(&ttyset, cspeed) < 0) {
/*
 Some people need to set the baud rate to ones not defined
 in termios.h

 This includes some baud rates which are supported by CommAPI
 in Unix ( 14400, 28800, 128000, 256000 )

 If the above fails, we assume this is not a defined
 baud rate on Unix.  With Win32, It is assumed the kernel
 will do this for us.

 The baud_base and desired speed are used to
 calculate a custom divisor.

 On linux the setserial man page covers this.
 */

#if defined(TIOCGSERIAL)
if (ioctl(fd, TIOCGSERIAL, &sstruct) < 0) {
	report("set_port_params: Cannot Get Serial Port Settings\n");
	return (1);
}
sstruct.custom_divisor = (sstruct.baud_base / cspeed);
#endif /* TIOCGSERIAL */
if (cfsetispeed(&ttyset, B38400) < 0 || cfsetospeed(&ttyset, B38400) < 0) {
	/* OK, we tried everything */
	report("nativeSetSerialPortParams: Cannot Set Speed\n");
	return (1);
}
#if defined(TIOCSSERIAL)
/*  It is assumed Win32 does this for us */
/*  Ignore errors if the target speed is 38400: In this case,
 *  just assume TIOCSSERIAL is not supported and custom speeds are
 *  not available. */
if (sstruct.baud_base < 1
		|| ioctl(fd, TIOCSSERIAL, &sstruct) < 0 && cspeed != 38400) {
	return (1);
}
#endif /* TIOCSSERIAL */
}

if (tcsetattr(fd, TCSANOW, &ttyset) < 0) {
report("tcsetattr returns nonzero value!\n");
return (1);
}
return (0);
}

/*----------------------------------------------------------
 RXTXPort.nativeSetSerialPortParams

 accept:     speed, data bits, stop bits, parity
 perform:    set the serial port parameters
 return:     jboolean 1 on error
 exceptions: UnsupportedCommOperationException
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeSetSerialPortParams)(JNIEnv *env,
jobject jobj, jint speed, jint dataBits, jint stopBits, jint parity) {
int fd = get_java_var(env, jobj, "fd", "I");
int cspeed = translate_speed(env, speed);

ENTER( "RXTXPort:nativeSetSerialPortParams" );
report_time_start( );

if (cspeed < 0) {
report(" invalid cspeed\n");
/*
 For some reason the native exceptions are not being caught.  Moving this
 to the Java side fixed the issue.  taj.
 throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
 "", "BaudRate could not be set to the specified value" );
 */
return (1);
}

if (set_port_params(env, fd, cspeed, dataBits, stopBits, parity)) {
report("set_port_params failed\n");
LEAVE( "RXTXPort:nativeSetSerialPortParams" );
/*
 For some reason the native exceptions are not being caught.  Moving this
 to the Java side fixed the issue.  taj.
 throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
 "nativeSetSerialPortParams", strerror( errno ) );
 */
return (1);
}

LEAVE( "RXTXPort:nativeSetSerialPortParams" );
report_time_end( );
return (0);
}

/*----------------------------------------------------------
 translate_speed

 accept:     speed in bits-per-second
 perform:    convert bits-per-second to a speed_t constant
 return:     speed_t constant
 exceptions: returns -1 and the calling method throws the exception so
 it may be caught in java.
 comments:   Only the lowest level code should know about
 the magic constants.
 ----------------------------------------------------------*/
int translate_speed(JNIEnv *env, jint speed) {
LEAVE( "RXTXPort:translate_speed" );
switch (speed) {
case 0:
return B0;
case 50:
return B50;
case 75:
return B75;
case 110:
return B110;
case 134:
return B134;
case 150:
return B150;
case 200:
return B200;
case 300:
return B300;
case 600:
return B600;
case 1200:
return B1200;
case 1800:
return B1800;
case 2400:
return B2400;
case 4800:
return B4800;
case 9600:
return B9600;
#ifdef B14400
case 14400: return B14400;
#endif /* B14400 */
case 19200:
return B19200;
#ifdef B28800
case 28800: return B28800;
#endif /* B28800 */
case 38400:
return B38400;
case 57600:
return B57600;
/* I don't think this is universal.. older UARTs never did these.  taj */
#ifdef B115200
case 115200:
return B115200;
#endif /*  B115200 */
#ifdef B128000  /* dima */
case 128000: return B128000;
#endif  /* dima */
#ifdef B230400
case 230400:
return B230400;
#endif /* B230400 */
#ifdef B256000  /* dima */
case 256000: return B256000;
#endif  /* dima */
#ifdef B460800
case 460800:
return B460800;
#endif /* B460800 */
#ifdef B500000
case 500000:
return B500000;
#endif /* B500000 */
#ifdef B576000
case 576000:
return B576000;
#endif /* B57600 */
#ifdef B921600
case 921600:
return B921600;
#endif /* B921600 */
#ifdef B1000000
case 1000000:
return B1000000;
#endif /* B1000000 */
#ifdef B1152000
case 1152000:
return B1152000;
#endif /* B1152000 */
#ifdef B1500000
case 1500000:
return B1500000;
#endif /* B1500000 */
#ifdef B2000000
case 2000000:
return B2000000;
#endif /* B2000000 */
#ifdef B2500000
case 2500000:
return B2500000;
#endif /* B2500000 */
#ifdef B3000000
case 3000000:
return B3000000;
#endif /* B3000000 */
#ifdef B3500000
case 3500000:
return B3500000;
#endif /* B3500000 */
#ifdef B4000000
case 4000000:
return B4000000;
#endif /* B4000000 */
}

/* Handle custom speeds */
if (speed >= 0)
return speed;
else {
LEAVE( "RXTXPort:translate_speed: Error condition" );
return -1;
}
}

/*----------------------------------------------------------
 translate_data_bits

 accept:     gnu.io.SerialPort.DATABITS_* constant
 perform:    set proper termios c_cflag bits
 return:     1 on error
 exceptions: UnsupportedCommOperationException
 ----------------------------------------------------------*/
int translate_data_bits(JNIEnv *env, tcflag_t *cflag, jint dataBits) {
int temp = (*cflag) & ~CSIZE;

ENTER( "translate_date_bits" );
switch (dataBits) {
case JDATABITS_5:
(*cflag) = temp | CS5;
return 0;
case JDATABITS_6:
(*cflag) = temp | CS6;
return 0;
case JDATABITS_7:
(*cflag) = temp | CS7;
return 0;
case JDATABITS_8:
(*cflag) = temp | CS8;
return 0;
}

LEAVE( "RXTXPort:translate_date_bits" );
/*
 For some reason the native exceptions are not being caught.  Moving this
 to the Java side fixed the issue.  taj.
 throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
 "", "databit value not supported" );
 */
return 1;
}

/*----------------------------------------------------------
 translate_stop_bits

 accept:     gnu.io.SerialPort.STOPBITS_* constant
 perform:    set proper termios c_cflag bits
 return:     1 on error
 exceptions: UnsupportedCommOperationException
 comments:   If you specify 5 data bits and 2 stop bits, the port will
 allegedly use 1.5 stop bits.  Does anyone care?
 ----------------------------------------------------------*/
int translate_stop_bits(JNIEnv *env, tcflag_t *cflag, jint stopBits) {
ENTER( "translate_stop_bits" );
switch (stopBits) {
case STOPBITS_1:
(*cflag) &= ~CSTOPB;
LEAVE( "RXTXPort:translate_stop_bits" );
return 0;
/*  ok.. lets try putting it in and see if anyone notices */
case STOPBITS_1_5:
(*cflag) |= CSTOPB;
if (translate_data_bits(env, cflag, JDATABITS_5))
	return (1);
return 0;
case STOPBITS_2:
(*cflag) |= CSTOPB;
LEAVE( "RXTXPort:translate_stop_bits" );
return 0;
}

LEAVE( "RXTXPort:translate_stop_bits" );
/*
 For some reason the native exceptions are not being caught.  Moving this
 to the Java side fixed the issue.  taj.
 throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
 "", "stopbit value not supported" );
 */
return 1;
}
JNIEXPORT jint JNICALL RXTXPort(nativeGetFlowControlMode)(JNIEnv *env,
jobject jobj, jint fd) {
struct termios ttyset;
int ret = 0;

tcgetattr(fd, &ttyset);

if (ttyset.c_cflag & HARDWARE_FLOW_CONTROL) {
ret |= ( FLOWCONTROL_RTSCTS_IN | FLOWCONTROL_RTSCTS_OUT);
}
if (ttyset.c_iflag & IXOFF) {
ret |= FLOWCONTROL_XONXOFF_IN;
}
if (ttyset.c_iflag & IXON) {
ret |= FLOWCONTROL_XONXOFF_OUT;
}
return ((jint) ret);
}
JNIEXPORT jint JNICALL RXTXPort(nativeGetParity)(JNIEnv *env, jobject jobj,
jint fd) {
struct termios ttyset;

if (tcgetattr(fd, &ttyset) < 0) {
report("nativeGetParity:  tcgetattr failed\n");
return (-1);
}
#ifdef  CMSPAR
if ((ttyset.c_cflag & PARENB) && (ttyset.c_cflag & PARODD)
	&& (ttyset.c_cflag & CMSPAR)) {
return ( JPARITY_MARK);
} else if (ttyset.c_cflag & ( PARENB && ttyset.c_cflag & CMSPAR)) {
return ( JPARITY_SPACE);
}
#endif /* CMSPAR */
if (ttyset.c_cflag & PARENB && ttyset.c_cflag & PARODD) {
return ( JPARITY_ODD);
} else if (ttyset.c_cflag & PARENB) {
return ( JPARITY_EVEN);
} else {
return ( JPARITY_NONE);
}
}

/*----------------------------------------------------------
 translate_parity

 accept:     javax.comm.SerialPort.PARITY_* constant
 perform:    set proper termios c_cflag bits
 return:     1 on error
 exceptions: UnsupportedCommOperationException
 comments:   The CMSPAR bit should be used for 'mark' and 'space' parity,
 but it's not in glibc's includes.  Oh well, rarely used anyway.
 ----------------------------------------------------------*/
int translate_parity(JNIEnv *env, tcflag_t *cflag, jint parity) {
ENTER( "translate_parity" );
#ifdef CMSPAR
(*cflag) &= ~(PARENB | PARODD | CMSPAR);
#endif /* CMSPAR */
switch (parity) {
case JPARITY_NONE:
LEAVE( "translate_parity" );
return 0;
case JPARITY_EVEN:
(*cflag) |= PARENB;
LEAVE( "translate_parity" );
return 0;
case JPARITY_ODD:
(*cflag) |= PARENB | PARODD;
LEAVE( "translate_parity" );
return 0;
#ifdef CMSPAR
case JPARITY_MARK:
(*cflag) |= PARENB | PARODD | CMSPAR;
LEAVE( "translate_parity" );
return 0;
case JPARITY_SPACE:
(*cflag) |= PARENB | CMSPAR;
LEAVE( "translate_parity" );
return 0;
#endif /* CMSPAR */
default:
printf("Parity missed %i\n", (int) parity);
}

LEAVE( "translate_parity" );
/*
 For some reason the native exceptions are not being caught.  Moving this
 to the Java side fixed the issue.  taj.
 throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
 "", "parity value not supported" );
 */
return 1;
}
#if !defined(TIOCSERGETLSR) && !defined(WIN32)
/*----------------------------------------------------------
 drain_loop()

 accept:
 perform:	call tcdrain() and report an event when it succeds
 return:      none
 exceptions:
 comments:
 ----------------------------------------------------------*/
void *drain_loop( void *arg )
{
struct event_info_struct *eis = ( struct event_info_struct * ) arg;
/* char msg[80]; */
int i;
pthread_detach( pthread_self() );

for(i=0;;i++)
{
report_verbose("drain_loop:  looping\n");
if( eis->eventloop_interrupted )
{
	goto end;
}
#if defined(__sun__)
/* FIXME: No time to test on all OS's for production */
if (usleep(5000)) {
	report("drain_loop:  received EINTR");
}
#else
if (usleep(1000000)) {
	report("drain_loop:  received EINTR");
}
#endif /* __sun__ */
/*
 system_wait();
 */
if( eis->eventloop_interrupted )
{
	goto end;
}
if( tcdrain( eis->fd ) == 0 )
{
	if( eis && eis->writing )
	{
		/*
		 sprintf(msg, "drain_loop: setting OUTPUT_BUFFER_EMPTY\n" );
		 report( msg );
		 */
		eis->output_buffer_empty_flag = 1;
		eis->writing=JNI_FALSE;
	}
	else
	{
		if( !eis )
		{
			goto end;
		}
		report_verbose("drain_loop:  writing not set\n");
	}
}
else if (errno != EINTR)
{
	report("drain_loop:  tcdrain bad fd\n");
	goto end;
}
else
{
	report("drain_loop:  received EINTR in tcdrain\n");
}
}
end:
report("------------------ drain_loop exiting ---------------------\n");
eis->closing = 1;
pthread_exit( NULL );
return( NULL );
}
#endif /* !defined(TIOCSERGETLSR) && !defined(WIN32) */
/*----------------------------------------------------------
 finalize_threads( )

 accept:      event_info_struct used to access java and communicate with
 eventLoop().
 perform:     see comments
 return:      none
 exceptions:  none
 comments:
 The is the pthread spawned on systems that can't access the
 LSR (Line Status Register).  Without access to the LSR rxtx
 cannot detect when the output buffer is empty in the Monitor
 Thread.  The solution is to return the value of write's return
 but hang around in this thread waiting for tcdrain to finish.

 once the drain has finished, we let the eventLoop know that the
 output buffer is empty and the Signal is sent.
 ----------------------------------------------------------*/
void finalize_threads(struct event_info_struct *eis) {
#if     !defined(TIOCSERGETLSR) && !defined( WIN32 )
/* used to shut down any remaining write threads */

eis->output_buffer_empty_flag = 0;
ENTER("finalize_threads\n");

/* need to clean up again after working events */
LEAVE("---------------- finalize_threads ---------------");
#endif /* TIOCSERGETLSR & !WIN32 */
}

#if !defined(TIOCSERGETLSR) && !defined( WIN32 )
static void warn_sig_abort( int signo )
{
/*
 char msg[80];
 sprintf( msg, "RXTX Recieved Signal %i\n", signo );
 report_error( msg );
 */
}
#endif /* TIOCSERGETLSR */

/*----------------------------------------------------------
 init_threads( )

 accept:      none
 perform:
 return:      none
 exceptions:  none
 comments:
 this function is called from the event_loop or in other words
 from the monitor thread. On systems !WIN32 and without TIOCSERGETLSR
 it will create a new thread looping a call to tcdrain.
 ----------------------------------------------------------*/
int init_threads(struct event_info_struct *eis) {
jfieldID jeis;
#if !defined(TIOCSERGETLSR) & !defined(WIN32)
sigset_t newmask, oldmask;
struct sigaction newaction, oldaction;
pthread_t tid;

report_time_start( );
report("init_threads:  start\n");
/* ignore child thread status changes */
sigemptyset(&newmask);
sigaddset(&newmask, SIGCHLD);

/* install our own signal hander */
newaction.sa_handler = warn_sig_abort;
sigemptyset( &newaction.sa_mask );
#ifdef SA_INTERRUPT
newaction.sa_flags = SA_INTERRUPT;
#endif /* SA_INTERRUPT */
#ifdef SA_RESTART
/* JOE: do not demand restart! we are handling EINTR */
/*	newaction.sa_flags = SA_RESTART;*/
#endif /* SA_RESTART */

sigaction(SIGABRT, &newaction, &oldaction);
sigaction(SIGCHLD, &newaction, &oldaction);
sigaction(SIGALRM, &newaction, &oldaction);
sigaction(SIGCONT, &newaction, &oldaction);
/*
 sigaction(SIGPOLL, &newaction, &oldaction);
 sigaction(SIGTRAP, &newaction, &oldaction);
 sigaction(SIGBUS, &newaction, &oldaction);
 sigaction(SIGSEGV, &newaction, &oldaction);
 sigaction(SIGFPE, &newaction, &oldaction);
 sigaction(SIGILL, &newaction, &oldaction);

 sigfillset(&newmask);
 sigprocmask( SIG_SETMASK, &newmask, &oldmask );
 pthread_sigmask( SIG_BLOCK, &newmask, &oldmask );
 */
sigprocmask( SIG_SETMASK, &newmask, &oldmask );

report("init_threads: creating drain_loop\n");
pthread_create( &tid, NULL, drain_loop, (void *) eis );
pthread_detach( tid );
eis->drain_tid = tid;
#endif /* TIOCSERGETLSR */
report("init_threads: get eis\n");
jeis = (*eis->env)->GetFieldID(eis->env, eis->jclazz, "eis", "J");
report("init_threads: set eis\n");
(*eis->env)->SetLongField(eis->env, *eis->jobj, jeis, (size_t) eis);
report("init_threads:  stop\n");
report_time_end( );
return (1);
}

/*----------------------------------------------------------
 RXTXPort.writeByte

 accept:      byte to write (passed as int)
 jboolean interrupted (no events if true)
 perform:     write a single byte to the port
 return:      none
 exceptions:  IOException
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(writeByte)( JNIEnv *env,
	jobject jobj, jint ji, jboolean interrupted )
{
#ifndef TIOCSERGETLSR
	struct event_info_struct *index = master_index;
#endif
	unsigned char byte = (unsigned char)ji;
	int fd = get_java_var( env, jobj,"fd","I" );
	int result;
	char msg[80];
#if defined ( __sun__ )
	int count;
#endif /* __sun__ */

	report_time_start();
	ENTER("RXTXPort:writeByte");do {
		sprintf( msg, "writeByte %c>>\n", byte );
		report( msg );
		result=WRITE (fd, (void * ) &byte, sizeof(unsigned char));
	}  while (result < 0 && errno==EINTR);
	if( result < 0 )
	{
		/* mexPrintf("GOT IT!!!\n"); */
		goto fail;
	}
/*
	This makes write for win32, glinux and Sol behave the same
#if defined ( __sun__ )
	do {
		report_verbose( "nativeDrain: trying tcdrain\n" );
		result=tcdrain(fd);
		count++;
	}  while (result && errno==EINTR && count <3);
#endif */ /* __sun __ */
#ifndef TIOCSERGETLSR
	if( ! interrupted )
	{
		index = master_index;
		if( index )
		{
			while( index->fd != fd &&
				index->next ) index = index->next;
		}
		index->writing = 1;
		report( "writeByte:  index->writing = 1" );
	}
#endif
	sprintf( msg, "RXTXPort:writeByte %i\n", result );
	report( msg );
	LEAVE("RXTXPort:writeByte");
if(result >= 0)
	{
		report_time_end();
		return;
	}
fail:
	throw_java_exception( env, IO_EXCEPTION, "writeByte",
		strerror( errno ) );
}

/*----------------------------------------------------------
RXTXPort.writeArray

   accept:      jbarray: bytes used for writing
                offset: offset in array to start writing
                count: Number of bytes to write
                jboolean interrupted (no events if true)
   perform:     write length bytes of jbarray
   return:      none
   exceptions:  IOException
----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(writeArray)( JNIEnv *env,
	jobject jobj, jbyteArray jbarray, jint offset, jint count,
		jboolean interrupted )
{
#ifndef TIOCSERGETLSR
	struct event_info_struct *index = master_index;
#endif /* TIOCSERGETLSR */
	int fd;
	int result=0,total=0;
	jbyte *body;
#if defined ( __sun__ )
	int icount;
#endif /* __sun__ */
	/*
	char message[1000];
	*/
#if defined ( __sun__ )
	struct timespec retspec;

	retspec.tv_sec = 0;
	retspec.tv_nsec = 50000;
#endif /* __sun__ */
	fd = get_java_var( env, jobj,"fd","I" );
	body = (*env)->GetByteArrayElements( env, jbarray, 0 );
	/* result=WRITE (fd, body + total + offset, count - total);
	(*env)->ReleaseByteArrayElements( env, jbarray, body, 0 ); */
/* return; OH CRAP */

	report_time_start();
	ENTER("writeArray");
/* warning Roy Rogers */
/*
 sprintf( message, "::::RXTXPort:writeArray(%s);\n", (char *) body );
 report_verbose( message );
 */

do {
		result=WRITE (fd, (void * ) ((char *) body + total + offset), count - total); /* dima */
		if(result >0){
			total += result;
		}
		report("writeArray()\n");
	}  while ( ( total < count ) && (result < 0 && errno==EINTR ) );
	if( result < 0 )
	{
		/* mexPrintf("GOT IT!!!\n"); */
		goto fail;
	}
/*
	This makes write for win32, glinux and Sol behave the same
#if defined ( __sun__ )
	do {
		report_verbose( "nativeDrain: trying tcdrain\n" );
		result=tcdrain(fd);
		icount++;
	}  while (result && errno==EINTR && icount <3);
#endif */ /* __sun__ */
	(*env)->ReleaseByteArrayElements( env, jbarray, body, 0 );
#ifndef TIOCSERGETLSR
	if( !interrupted )
	{
		if( index )
		{
			while( index->fd != fd &&
				index->next ) index = index->next;
		}
		index->writing = 1;
		report( "writeArray:  index->writing = 1" );
	}
#endif /* TIOCSERGETLSR */
	/*
		50 ms sleep to make sure read can get in

		what I think is happening here is the data writen is causing
		signals, the event loop can't select with data available

		I think things like BlackBox with 2 ports open are getting
		signals for both the reciever and transmitter since they
		are the same PID.

		Things just start spinning out of control after that.
	*/
	LEAVE("RXTXPort:writeArray");
report_time_end();
fail:
if( result < 0 ) throw_java_exception( env, IO_EXCEPTION,
"writeArray", strerror( errno ) );
}

/*----------------------------------------------------------
 RXTXPort.nativeDrain

 accept:      jboolean interrupted (no events if true)
 perform:     wait until all data is transmitted
 return:      none
 exceptions:  IOException
 comments:    java.io.OutputStream.flush() is equivalent to tcdrain,
 not tcflush, which throws away unsent bytes

 count logic added to avoid infinite loops when EINTR is
 true...  Thread.yeild() was suggested.
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeDrain)(JNIEnv *env, jobject jobj,
jboolean interrupted) {
int fd = get_java_var(env, jobj, "fd", "I");
struct event_info_struct *eis = (struct event_info_struct *) get_java_var_long(
env, jobj, "eis", "J");
int result, count = 0;

char message[80];

ENTER( "SerialImp.c:drain()" );
report_time_start( );
do {
report_verbose("nativeDrain: trying tcdrain\n");
result = tcdrain(fd);
count++;
} while (result && errno == EINTR && count < 3);

sprintf(message, "RXTXPort:drain() returns: %i\n", result);
report_verbose(message);
#if defined(__sun__)
/* FIXME: No time to test on all OS's for production */
return( JNI_TRUE );
#endif /* __sun__ */
LEAVE( "RXTXPort:drain()" );
if (result)
throw_java_exception(env, IO_EXCEPTION, "nativeDrain", strerror( errno));
if (interrupted)
return (JNI_FALSE);
#if !defined(TIOCSERGETLSR) && !defined(WIN32)
if( eis && eis->writing )
{
eis->writing=JNI_FALSE;
eis->output_buffer_empty_flag = 0;
}
#endif /* !TIOCSERGETLSR !WIN32 */
if (eis && eis->eventflags[SPE_OUTPUT_BUFFER_EMPTY]) {
struct event_info_struct myeis = build_threadsafe_eis(env, &jobj, eis);
send_event(&myeis, SPE_OUTPUT_BUFFER_EMPTY, 1);
}
report_time_end( );
return (JNI_FALSE);
}

/*----------------------------------------------------------
 RXTXPort.sendBreak

 accept:     duration in milliseconds.
 perform:    send break for actual time.  not less than 0.25 seconds.
 exceptions: none
 comments:   not very precise
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(sendBreak)( JNIEnv *env,
	jobject jobj, jint duration )
{
	int fd = get_java_var( env, jobj,"fd","I" );
	report_time_start( );
	ENTER("RXTXPort:sendBreak()");tcsendbreak( fd, (int)( duration / 250 ) );
	report_time_end( );
	LEAVE("RXTXPort:sendBreak()");
}

/*----------------------------------------------------------
 RXTXPort.NativegetReceiveTimeout

 accept:     none
 perform:    get termios.c_cc[VTIME]
 return:     VTIME
 comments:   see  NativeEnableReceiveTimeoutThreshold
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(NativegetReceiveTimeout)(JNIEnv *env,
jobject jobj) {
int fd = get_java_var(env, jobj, "fd", "I");
struct termios ttyset;

ENTER( "RXTXPort:nativegetRecieveTimeout()" );
if (tcgetattr(fd, &ttyset) < 0)
goto fail; LEAVE( "RXTXPort:nativegetRecieveTimeout()" );
return (ttyset.c_cc[ VTIME] * 100);
fail: LEAVE( "RXTXPort:nativegetRecieveTimeout()" );
throw_java_exception(env, IO_EXCEPTION, "getReceiveTimeout", strerror( errno));
return -1;
}

/*----------------------------------------------------------
 RXTXPort.NativeisReceiveTimeoutEnabled

 accept:     none
 perform:    determine if VTIME is none 0
 return:     JNI_TRUE if VTIME > 0 else JNI_FALSE
 comments:   see  NativeEnableReceiveTimeoutThreshold
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(NativeisReceiveTimeoutEnabled)(JNIEnv *env,
jobject jobj) {
int fd = get_java_var(env, jobj, "fd", "I");
struct termios ttyset;
ENTER( "RXTXPort:NativeisRecieveTimeoutEnabled()" );
if (tcgetattr(fd, &ttyset) < 0)
goto fail; LEAVE( "RXTXPort:NativeisRecieveTimeoutEnabled()" );
return (ttyset.c_cc[ VTIME] > 0 ? JNI_TRUE : JNI_FALSE);
fail: LEAVE( "RXTXPort:NativeisRecieveTimeoutEnabled()" );
throw_java_exception(env, IO_EXCEPTION, "isReceiveTimeoutEnabled",
strerror( errno));
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.isDSR

 accept:      none
 perform:     check status of DSR
 return:      true if TIOCM_DSR is set
 false if TIOCM_DSR is not set
 exceptions:  none
 comments:    DSR stands for Data Set Ready
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(isDSR)(JNIEnv *env, jobject jobj) {
unsigned int result = 0;
int fd = get_java_var(env, jobj, "fd", "I");
char message[80];

ENTER( "RXTXPort:isDSR" );
ioctl(fd, TIOCMGET, &result);
sprintf(message, "RXTXPort:isDSR returns %i\n", result & TIOCM_DSR);
report(message);
LEAVE( "RXTXPort:isDSR" );
if (result & TIOCM_DSR)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.isCD

 accept:      none
 perform:     check status of CD
 return:      true if TIOCM_CD is set
 false if TIOCM_CD is not set
 exceptions:  none
 comments:    CD stands for Carrier Detect
 The following comment has been made...
 "well, it works, there might ofcourse be a bug, but making DCD
 permanently on fixed it for me so I don't care"

 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(isCD)(JNIEnv *env, jobject jobj) {
unsigned int result = 0;
int fd = get_java_var(env, jobj, "fd", "I");
char message[80];

ENTER( "RXTXPort:isCD" );
ioctl(fd, TIOCMGET, &result);
sprintf(message, "RXTXPort:isCD returns %i\n", result & TIOCM_CD);
LEAVE( "RXTXPort:isCD" );
if (result & TIOCM_CD)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.isCTS

 accept:      none
 perform:     check status of CTS
 return:      true if TIOCM_CTS is set
 false if TIOCM_CTS is not set
 exceptions:  none
 comments:    CTS stands for Clear To Send.
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(isCTS)(JNIEnv *env, jobject jobj) {
unsigned int result = 0;
int fd = get_java_var(env, jobj, "fd", "I");
char message[80];

ENTER( "RXTXPort:isCTS" );
ioctl(fd, TIOCMGET, &result);
sprintf(message, "RXTXPort:isCTS returns %i\n", result & TIOCM_CTS);
report(message);
LEAVE( "RXTXPort:isCTS" );
if (result & TIOCM_CTS)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.isRI

 accept:      none
 perform:     check status of RI
 return:      true if TIOCM_RI is set
 false if TIOCM_RI is not set
 exceptions:  none
 comments:    RI stands for Ring Indicator
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(isRI)(JNIEnv *env, jobject jobj) {
unsigned int result = 0;
int fd = get_java_var(env, jobj, "fd", "I");
char message[80];

ENTER( "RXTXPort:isRI" );
ioctl(fd, TIOCMGET, &result);
sprintf(message, "RXTXPort:isRI returns %i\n", result & TIOCM_RI);
report(message);
LEAVE( "RXTXPort:isRI" );
if (result & TIOCM_RI)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.isRTS

 accept:      none
 perform:     check status of RTS
 return:      true if TIOCM_RTS is set
 false if TIOCM_RTS is not set
 exceptions:  none
 comments:    tcgetattr with c_cflag CRTS_IFLOW
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(isRTS)(JNIEnv *env, jobject jobj) {
unsigned int result = 0;
int fd = get_java_var(env, jobj, "fd", "I");
char message[80];

ENTER( "RXTXPort:isRTS" );
ioctl(fd, TIOCMGET, &result);
sprintf(message, "RXTXPort:isRTS returns %i\n", result & TIOCM_RTS);
report(message);
LEAVE( "RXTXPort:isRTS" );
if (result & TIOCM_RTS)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.setRTS

 accept:      state  flag to set/unset.
 perform:     depends on the state flag
 if true TIOCM_RTS is set
 if false TIOCM_RTS is unset
 return:      none
 exceptions:  none
 comments:    tcsetattr with c_cflag CRTS_IFLOW
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(setRTS)( JNIEnv *env,
	jobject jobj, jboolean state )
{
	unsigned int result = 0;
	int fd = get_java_var( env, jobj,"fd","I" );
	char message[80];

	ENTER("RXTXPort:setRTS");ioctl( fd, TIOCMGET, &result );
	if( state == JNI_TRUE ) result |= TIOCM_RTS;
	else result &= ~TIOCM_RTS;
	ioctl( fd, TIOCMSET, &result );
	sprintf( message, "setRTS( %i )\n", state );
	report( message );
	LEAVE("RXTXPort:setRTS");
return;
}

/*----------------------------------------------------------
RXTXPort.setDSR

   accept:      state  flag to set/unset.
   perform:     depends on the state flag
                if true TIOCM_DSR is set
                if false TIOCM_DSR is unset
   return:      none
   exceptions:  none
   comments:    tcsetattr with c_cflag CRTS_IFLOW
----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(setDSR)( JNIEnv *env,
	jobject jobj, jboolean state )
{
	unsigned int result = 0;
	int fd = get_java_var( env, jobj,"fd","I" );
	char message[80];

	ENTER("RXTXPort:setDSR()");ioctl( fd, TIOCMGET, &result );

	sprintf( message, "setDSR( %i )\n", state );
	if( state == JNI_TRUE ) result |= TIOCM_DSR;
	else result &= ~TIOCM_DSR;
	ioctl( fd, TIOCMSET, &result );
	sprintf( message, "setDSR( %i )\n", state );
	report( message );
	LEAVE("RXTXPort:setDSR()");
return;
}

/*----------------------------------------------------------
 RXTXPort.isDTR

 accept:      none
 perform:     check status of DTR
 return:      true if TIOCM_DTR is set
 false if TIOCM_DTR is not set
 exceptions:  none
 comments:    DTR stands for Data Terminal Ready
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(isDTR)(JNIEnv *env, jobject jobj) {
unsigned int result = 0;
int fd = get_java_var(env, jobj, "fd", "I");
char message[80];

ENTER( "RXTXPort:isDTR" );
ioctl(fd, TIOCMGET, &result);
sprintf(message, "isDTR( ) returns %i\n", result & TIOCM_DTR);
report(message);
LEAVE( "RXTXPort:isDTR" );
if (result & TIOCM_DTR)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.setDTR

 accept:      new DTR state
 perform:     if state is true, TIOCM_DTR is set
 if state is false, TIOCM_DTR is unset
 return:      none
 exceptions:  none
 comments:    DTR stands for Data Terminal Ready
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(setDTR)( JNIEnv *env,
	jobject jobj, jboolean state )
{
	unsigned int result = 0;
	int fd = get_java_var( env, jobj,"fd","I" );
	char message[80];

	ENTER("RXTXPort:setDTR");ioctl( fd, TIOCMGET, &result );
	if( state == JNI_TRUE ) result |= TIOCM_DTR;
	else result &= ~TIOCM_DTR;
	ioctl( fd, TIOCMSET, &result );
	sprintf( message, "setDTR( %i )\n", state );
	report( message );
	LEAVE("RXTXPort:setDTR"); return;
}
/*----------------------------------------------------------
 RXTXPort.static_add_filename

 accept:      filename and fd to save
 perform:     add a struct holding the info to a linked list
 return:      none
 exceptions:  none
 comments:    the info is checked on open() if its in the list no
 changes are performed on the file on open()

 comments:    see
 RXTXPort.nativeStaticSetDSR
 RXTXPort.nativeStaticSetDTR
 RXTXPort.nativeStaticSetRTS
 RXTXPort.nativeStaticSetSerialPortParams
 This is used so people can setDTR low before calling the
 -----------------------------------------------------------*/

void static_add_filename(const char *filename, int fd) {
struct preopened *newp, *p = preopened_port;

newp = malloc(sizeof(struct preopened));
strcpy(newp->filename, filename);
newp->fd = fd;

if (!p) {
newp->next = NULL;
newp->prev = NULL;
preopened_port = newp;
return;
}
for (;;) {
if (!strcmp(p->filename, filename)) {
/* already open */
return;
}
if (p->next) {
p = p->next;
} else {
/* end of list */
newp->next = NULL;
newp->prev = p;
p->next = newp;
preopened_port = p;
return;
}
}
}
/*----------------------------------------------------------
 RXTXPort.nativeSetBaudBase

 accept:      The Baud Base for custom speeds
 perform:     set the Baud Base
 return:      0 on success
 exceptions:  Unsupported Comm Operation on systems not supporting
 TIOCGSERIAL
 comments:
 Set baud rate to 38400 before using this
 First introduced in rxtx-2.1-3
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeSetBaudBase)(JNIEnv *env,
jobject jobj, jint BaudBase) {

#if defined(TIOCGSERIAL)

int fd = get_java_var(env, jobj, "fd", "I");
struct serial_struct sstruct;

if (ioctl(fd, TIOCGSERIAL, &sstruct) < 0) {
goto fail;
}

sstruct.baud_base = (int) BaudBase;

if (sstruct.baud_base < 1 || ioctl(fd, TIOCSSERIAL, &sstruct) < 0) {
goto fail;
}
return ((jboolean) 0);
fail: throw_java_exception(env, IO_EXCEPTION, "nativeSetBaudBase",
strerror( errno));
return ((jboolean) 1);
#else
throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
"nativeSetBaudBase", strerror( errno ) );
return( ( jboolean ) 1 );
#endif /* TIOCGSERIAL */
}

/*----------------------------------------------------------
 RXTXPort.nativeGetBaudBase

 accept:      the Baud Base used for custom speeds
 perform:
 return:      Baud Base
 exceptions:  Unsupported Comm Operation on systems not supporting
 TIOCGSERIAL
 comments:
 First introduced in rxtx-2.1-3
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeGetBaudBase)(JNIEnv *env, jobject jobj) {

#if defined(TIOCGSERIAL)

int fd = get_java_var(env, jobj, "fd", "I");
struct serial_struct sstruct;

if (ioctl(fd, TIOCGSERIAL, &sstruct) < 0) {
goto fail;
}
return ((jint)(sstruct.baud_base));
fail: throw_java_exception(env, IO_EXCEPTION, "nativeGetBaudBase",
strerror( errno));
return ((jint) - 1);
#else
throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
"nativeGetBaudBase", strerror( errno ) );
return( ( jint ) -1 );
#endif /* TIOCGSERIAL */
}

/*----------------------------------------------------------
 RXTXPort.nativeSetDivisor

 accept:      Divisor for custom speeds
 perform:     set the Divisor for custom speeds
 return:      0 on success
 exceptions:  Unsupported Comm Operation on systems not supporting
 TIOCGSERIAL
 comments:
 Set baud rate to 38400 before using this
 First introduced in rxtx-2.1-3
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeSetDivisor)(JNIEnv *env, jobject jobj,
jint Divisor) {

#if defined(TIOCGSERIAL)

int fd = get_java_var(env, jobj, "fd", "I");
struct serial_struct sstruct;

if (ioctl(fd, TIOCGSERIAL, &sstruct) < 0) {
goto fail;
}

if (sstruct.custom_divisor < 1 || ioctl(fd, TIOCSSERIAL, &sstruct) < 0) {
goto fail;
}
return ((jboolean) 0);
fail: throw_java_exception(env, IO_EXCEPTION, "nativeSetDivisor",
strerror( errno));
return ((jboolean) 1);
#else
throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
"nativeSetDivisor", strerror( errno ) );
return( ( jboolean ) 1 );
#endif /* TIOCGSERIAL */
}

/*----------------------------------------------------------
 RXTXPort.nativeGetDivisor

 accept:      none
 perform:     Find the Divisor used for custom speeds
 return:      Divisor negative value on error.
 exceptions:  Unsupported Comm Operation on systems not supporting
 TIOCGSERIAL
 comments:
 First introduced in rxtx-2.1-3
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeGetDivisor)(JNIEnv *env, jobject jobj) {

#if defined(TIOCGSERIAL)

int fd = get_java_var(env, jobj, "fd", "I");
struct serial_struct sstruct;

if (ioctl(fd, TIOCGSERIAL, &sstruct) < 0) {
goto fail;
}

return ((jint) sstruct.custom_divisor);
fail: throw_java_exception(env, IO_EXCEPTION, "nativeGetDivisor",
strerror( errno));
return ((jint) - 1);
#else
throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
"nativeGetDivisor", strerror( errno ) );
return( ( jint ) -1 );
#endif /* TIOCGSERIAL */
}

/*----------------------------------------------------------
 RXTXPort.nativeStaticSetDSR

 accept:      new RTS state
 perform:     if flag is true, TIOCM_DSR is set
 if flag is false, TIOCM_DSR is unset
 return:      none
 exceptions:  none
 comments:    Set the DSR so it does not raise on the next open
 needed for some funky test boards?

 This is static so we can not call the open() setDSR()
 we dont have the jobject.

 First introduced in rxtx-1.5-9
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticSetDSR)(JNIEnv *env,
jclass jclazz, jstring jstr, jboolean flag) {
int fd;
int pid = -1;
int result;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);

ENTER( "RXTXPort:nativeStaticSetDSR" );
#ifndef WIN32
pid = getpid();
#endif /* WIN32 */

/* Open and lock the port so nothing else changes the setting */

if ( LOCK(filename, pid))
goto fail;

fd = find_preopened_ports(filename);
if (!fd) {
do {
fd = OPEN(filename, O_RDWR | O_NOCTTY | O_NONBLOCK);
} while (fd < 0 && errno == EINTR);
if (configure_port(fd))
goto fail;
}
if (fd < 0)
goto fail;

/* raise the DSR */

ioctl(fd, TIOCMGET, &result);
if (flag == JNI_TRUE)
result |= TIOCM_DSR;
else
result &= ~TIOCM_DSR;
ioctl(fd, TIOCMSET, &result);

/* Unlock the port.  Good luck! :) */

UNLOCK(filename, pid);

static_add_filename(filename, fd);

/* dont close the port.  Its not clear if the DSR would remain high */
(*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:nativeStaticSetDSR" );
return (JNI_TRUE);
fail: (*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:nativeStaticSetDSR" );
return (JNI_FALSE);
}

/*----------------------------------------------------------
 RXTXPort.nativeStaticSetRTS

 accept:      new RTS state
 perform:     if flag is true, TIOCM_RTS is set
 if flag is false, TIOCM_RTS is unset
 return:      none
 exceptions:  none
 comments:    Set the RTS so it does not raise on the next open
 needed for some funky test boards?

 This is static so we can not call the open() setDTR()
 we dont have the jobject.

 First introduced in rxtx-1.5-9
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticSetRTS)(JNIEnv *env,
jclass jclazz, jstring jstr, jboolean flag) {
int fd;
int pid = -1;
int result;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);

ENTER( "RXTXPort:nativeStaticSetRTS" );
#ifndef WIN32
pid = getpid();
#endif /* WIN32 */

/* Open and lock the port so nothing else changes the setting */

if ( LOCK(filename, pid))
goto fail;;

fd = find_preopened_ports(filename);
if (!fd) {
do {
fd = OPEN(filename, O_RDWR | O_NOCTTY | O_NONBLOCK);
} while (fd < 0 && errno == EINTR);
if (configure_port(fd))
goto fail;
}
if (fd < 0)
goto fail;

/* raise the RTS */

ioctl(fd, TIOCMGET, &result);
if (flag == JNI_TRUE)
result |= TIOCM_RTS;
else
result &= ~TIOCM_RTS;
ioctl(fd, TIOCMSET, &result);

/* Unlock the port.  Good luck! :) */

UNLOCK(filename, pid);

static_add_filename(filename, fd);

/* dont close the port.  Its not clear if the RTS would remain high */
(*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:nativeStaticSetRTS" );
return (JNI_TRUE);
fail: (*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:nativeStaticSetRTS" );
return (JNI_FALSE);
}

/*----------------------------------------------------------
 RXTXPort.nativeStaticSetSerialPortParams

 accept:      string for the filename, int baudrate, int databits,
 int stopbits, int parity
 perform:     set the serial port, set the params, save the fd in a linked
 list.
 return:      none
 exceptions:  none
 comments:    Not set the speed on the next 'open'

 This is static so we can not call the open() setDTR()
 we dont have the jobject.

 First introduced in rxtx-1.5-9
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(nativeStaticSetSerialPortParams)(JNIEnv *env,
	jclass jclazz, jstring jstr, jint baudrate, jint dataBits, jint stopBits, jint parity )
{
	int fd;
	int  pid = -1;
	const char *filename = (*env)->GetStringUTFChars( env, jstr, 0 );
	int cspeed = translate_speed( env, baudrate );


	ENTER(
"RXTXPort:nativeStaticSetSerialPortParams");
#ifndef WIN32
pid = getpid();
#endif /* WIN32 */
	/* Open and lock the port so nothing else changes the setting */

	if ( LOCK( filename, pid ) ) goto fail;

	fd = find_preopened_ports( filename );
	if( !fd )
	{
		do {
			fd = OPEN (filename, O_RDWR | O_NOCTTY | O_NONBLOCK );
		}  while (fd < 0 && errno==EINTR);
		if ( configure_port( fd ) ) goto fail;
	}

	if ( fd < 0 )
	{
		(*env)->ReleaseStringUTFChars( env, jstr, filename );
		LEAVE("RXTXPort:nativeStaticSetSerialPortParams");throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
			"nativeStaticSetSerialPortParams", strerror( errno ) );
		return;
	}

	if (cspeed == -1)
	{
		(*env)->ReleaseStringUTFChars( env, jstr, filename );
		throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
			"", "BaudRate could not be set to the specified value" );
		return;
	}

	if( set_port_params( env, fd, cspeed, dataBits, stopBits, parity ) )
	{
		(*env)->ReleaseStringUTFChars( env, jstr, filename );
		LEAVE(
"RXTXPort:nativeStatic SetSerialPortParams");throw_java_exception( env, UNSUPPORTED_COMM_OPERATION,
			"nativeStaticSetSerialPortParams", strerror( errno ) );
		return;
	}

	/* Unlock the port.  Good luck! :) */

	UNLOCK( filename,  pid );

	static_add_filename( filename, fd );
	/* dont close the port. */

	(*env)->ReleaseStringUTFChars( env, jstr, filename );
	LEAVE(
"RXTXPort:nativeStaticSetSerialPortParams");return;
fail:
	(*env)->ReleaseStringUTFChars( env, jstr, filename );
	LEAVE(
"RXTXPort:nativeStaticSetSerialPortParams");
return;
}

/*----------------------------------------------------------
 RXTXPort.nativeStaticSetDTR

 accept:      new DTR state
 perform:     if flag is true, TIOCM_DTR is set
 if flag is false, TIOCM_DTR is unset
 return:      none
 exceptions:  none
 comments:    Set the DTR so it does not raise on the next open
 needed for some funky test boards?

 This is static so we can not call the open() setDTR()
 we dont have the jobject.

 First introduced in rxtx-1.5-9
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticSetDTR)(JNIEnv *env,
jclass jclazz, jstring jstr, jboolean flag) {
int fd;
int pid = -1;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int result;

ENTER( "RXTXPort:nativeStaticSetDTR" );
#ifndef WIN32
pid = getpid();
#endif /* WIN32 */

/* Open and lock the port so nothing else changes the setting */

if ( LOCK(filename, pid))
goto fail;;

fd = find_preopened_ports(filename);
if (!fd) {
do {
fd = OPEN(filename, O_RDWR | O_NOCTTY | O_NONBLOCK);
} while (fd < 0 && errno == EINTR);
if (configure_port(fd))
goto fail;
}
if (fd < 0)
goto fail;

/* raise the DTR */

ioctl(fd, TIOCMGET, &result);
if (flag == JNI_TRUE)
result |= TIOCM_DTR;
else
result &= ~TIOCM_DTR;
ioctl(fd, TIOCMSET, &result);

/* Unlock the port.  Good luck! :) */

UNLOCK(filename, pid);

static_add_filename(filename, fd);
/* dont close the port.  Its not clear if the DTR would remain high */

(*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:nativeStaticSetDTR" );
return (JNI_TRUE);
fail: (*env)->ReleaseStringUTFChars(env, jstr, filename);
LEAVE( "RXTXPort:nativeStaticSetDTR" );
return (JNI_FALSE);
}

/*----------------------------------------------------------
 RXTXPort.nativeStaticIsRTS

 accept:      filename
 perform:     check status of RTS of preopened ports (setting lines/params
 before calling the Java open()
 return:      true if TIOCM_RTS is set
 false if TIOCM_RTS is not set
 exceptions:  none
 comments:    RTS stands for Request to Send
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticIsRTS)(JNIEnv *env,
jobject jobj, jstring jstr) {
unsigned int result = 0;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
char message[80];

ENTER( "RXTXPort:nativeStaticIsRTS" );
if (!fd) {
/* Exception? FIXME */
return JNI_FALSE;
}
ioctl(fd, TIOCMGET, &result);
sprintf(message, "nativeStaticIsRTS( ) returns %i\n", result & TIOCM_RTS);
report(message);
LEAVE( "RXTXPort:nativeStaticIsRTS" );
if (result & TIOCM_RTS)
return JNI_TRUE;
else
return JNI_FALSE;
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticIsDSR

 accept:      filename
 perform:     check status of DSR of preopened ports (setting lines/params
 before calling the Java open()
 return:      true if TIOCM_DSR is set
 false if TIOCM_DSR is not set
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticIsDSR)(JNIEnv *env,
jobject jobj, jstring jstr) {
unsigned int result = 0;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
char message[80];

ENTER( "RXTXPort:nativeStaticIsDSR" );
if (!fd) {
/* Exception? FIXME */
return JNI_FALSE;
}
ioctl(fd, TIOCMGET, &result);
sprintf(message, "nativeStaticIsDSR( ) returns %i\n", result & TIOCM_DSR);
report(message);
LEAVE( "RXTXPort:nativeStaticIsDSR" );
if (result & TIOCM_DSR)
return JNI_TRUE;
else
return JNI_FALSE;
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticIsDTR

 accept:      filename
 perform:     check status of DTR of preopened ports (setting lines/params
 before calling the Java open()
 return:      true if TIOCM_DTR is set
 false if TIOCM_DTR is not set
 exceptions:  none
 comments:    DTR stands for Data Terminal Ready
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticIsDTR)(JNIEnv *env,
jobject jobj, jstring jstr) {
unsigned int result = 0;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
char message[80];

ENTER( "RXTXPort:nativeStaticIsDTR" );
if (!fd) {
/* Exception? FIXME */
return JNI_FALSE;
}
ioctl(fd, TIOCMGET, &result);
sprintf(message, "nativeStaticIsDTR( ) returns %i\n", result & TIOCM_DTR);
report(message);
LEAVE( "RXTXPort:nativeStaticIsDTR" );
if (result & TIOCM_DTR)
return JNI_TRUE;
else
return JNI_FALSE;
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticIsCD

 accept:      filename
 perform:     check status of CD of preopened ports (setting lines/params
 before calling the Java open()
 return:      true if TIOCM_CD is set
 false if TIOCM_CD is not set
 exceptions:  none
 comments:    CD stands for carrier detect
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticIsCD)(JNIEnv *env, jobject jobj,
jstring jstr) {
unsigned int result = 0;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
char message[80];

ENTER( "RXTXPort:nativeStaticIsCD" );
if (!fd) {
/* Exception? FIXME */
return JNI_FALSE;
}
ioctl(fd, TIOCMGET, &result);
sprintf(message, "nativeStaticIsCD( ) returns %i\n", result & TIOCM_CD);
report(message);
LEAVE( "RXTXPort:nativeStaticIsCD" );
if (result & TIOCM_CD)
return JNI_TRUE;
else
return JNI_FALSE;
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticIsCTS

 accept:      filename
 perform:     check status of CTS of preopened ports (setting lines/params
 before calling the Java open()
 return:      true if TIOCM_CTS is set
 false if TIOCM_CTS is not set
 exceptions:  none
 comments:    CTS stands for Clear To Send
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticIsCTS)(JNIEnv *env,
jobject jobj, jstring jstr) {
unsigned int result = 0;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
char message[80];

ENTER( "RXTXPort:nativeStaticIsCTS" );
if (!fd) {
/* Exception? FIXME */
return JNI_FALSE;
}
ioctl(fd, TIOCMGET, &result);
sprintf(message, "nativeStaticIsCTS( ) returns %i\n", result & TIOCM_CTS);
report(message);
LEAVE( "RXTXPort:nativeStaticIsCTS" );
if (result & TIOCM_CTS)
return JNI_TRUE;
else
return JNI_FALSE;
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticIsRI

 accept:      filename
 perform:     check status of RI of preopened ports (setting lines/params
 before calling the Java open()
 return:      true if TIOCM_RI is set
 false if TIOCM_RI is not set
 exceptions:  none
 comments:    RI stands for carrier detect
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeStaticIsRI)(JNIEnv *env, jobject jobj,
jstring jstr) {
unsigned int result = 0;
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
char message[80];

ENTER( "RXTXPort:nativeStaticIsRI" );
if (!fd) {
/* Exception? FIXME */
return JNI_FALSE;
}
ioctl(fd, TIOCMGET, &result);
sprintf(message, "nativeStaticRI( ) returns %i\n", result & TIOCM_RI);
report(message);
LEAVE( "RXTXPort:nativeStaticIsRI" );
if (result & TIOCM_RI)
return JNI_TRUE;
else
return JNI_FALSE;
}

/*----------------------------------------------------------
 RXTXPort.nativeStaticGetBaudRate

 accept:      filename
 perform:     find the baud rate (not all buads are handled yet)
 return:      return the baud rate or -1 if not supported yet.
 exceptions:
 comments:    simple test for preopened ports
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeStaticGetBaudRate)(JNIEnv *env,
jobject jobj, jstring jstr) {
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
struct termios ttyset;
int baudrate;
(*env)->ReleaseStringUTFChars(env, jstr, filename);

ENTER( "RXTXPort:nativeStaticGetBaudRate" );
if (!fd) {
/* Exception? FIXME */
return -1;
}
if (tcgetattr(fd, &ttyset) < 0) {
report("nativeStaticGetBaudRate: Cannot Get Serial Port Settings\n");
return (-1);
}
/*
 dima writes:

 Trent, here is something I found with google:
 (freebsd list freebsd-current@freebsd.org)

 Andrzej Bialecki <abial@korin.warman.org.pl> asked:
 I tried to compile a piece of software, probably for Linux, and I noticed
 that we don't define CBAUD constant. I'm not sure, but I think POSIX
 defines and uses it. Should(n't) we?

 Bruce Evans <bde@zeta.org.au> answered:
 CBAUD is for SYSV compatibility.  It is considerably inferior to POSIX's
 cf{get,set}{i,o}speed and shouldn't be provided or used.

 */
#if defined(CBAUD)/* dima */
baudrate = ttyset.c_cflag & CBAUD;
#else
if(cfgetispeed(&ttyset) != cfgetospeed(&ttyset)) return -1;
baudrate = cfgetispeed(&ttyset);
#endif
return (get_java_baudrate(baudrate));
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticGetDataBits

 accept:      filename
 perform:     find the data bits (not all buads are handled yet)
 return:      return the data bits
 exceptions:
 comments:    simple test for preopened ports
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeStaticGetDataBits)(JNIEnv *env,
jobject jobj, jstring jstr) {
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
struct termios ttyset;
(*env)->ReleaseStringUTFChars(env, jstr, filename);

ENTER( "RXTXPort:nativeStaticGetDataBits" );
if (!fd) {
/* Exception? FIXME */
return -1;
}
if (tcgetattr(fd, &ttyset) < 0) {
report("nativeStaticGetDataBits: Cannot Get Serial Port Settings\n");
return (-1);
}
switch (ttyset.c_cflag & CSIZE) {
case CS5:
return JDATABITS_5;
case CS6:
return JDATABITS_6;
case CS7:
return JDATABITS_7;
case CS8:
return JDATABITS_8;
default:
return (-1);
}
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticGetParity

 accept:      filename
 perform:     find the parity
 return:      return the parity
 exceptions:
 comments:    simple test for preopened ports
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeStaticGetParity)(JNIEnv *env,
jobject jobj, jstring jstr) {
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
struct termios ttyset;
(*env)->ReleaseStringUTFChars(env, jstr, filename);

ENTER( "RXTXPort:nativeStaticGetParity" );
if (!fd) {
/* Exception? FIXME */
return -1;
}
if (tcgetattr(fd, &ttyset) < 0) {
report("nativeStaticGetParity: Cannot Get Serial Port Settings\n");
return (-1);
}
#ifdef CMSPAR
switch (ttyset.c_cflag & (PARENB | PARODD | CMSPAR)) {
#else
switch( ttyset.c_cflag&(PARENB|PARODD) ) {
#endif /* CMSPAR */
case 0:
return JPARITY_NONE;
case PARENB:
return JPARITY_EVEN;
case PARENB | PARODD:
return JPARITY_ODD;
#ifdef CMSPAR
case PARENB | PARODD | CMSPAR:
return JPARITY_MARK;
case PARENB | CMSPAR:
return JPARITY_SPACE;
#endif /* CMSPAR */
default:
return (-1);
}
}
/*----------------------------------------------------------
 RXTXPort.nativeStaticGetStopBits

 accept:      filename
 perform:     find the stop bits
 return:      return the stop bits
 exceptions:
 comments:    simple test for preopened ports
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeStaticGetStopBits)(JNIEnv *env,
jobject jobj, jstring jstr) {
const char *filename = (*env)->GetStringUTFChars(env, jstr, 0);
int fd = find_preopened_ports(filename);
struct termios ttyset;
(*env)->ReleaseStringUTFChars(env, jstr, filename);

ENTER( "RXTXPort:nativeStaticGetStopBits" );
if (!fd) {
/* Exception? FIXME */
return -1;
}
if (tcgetattr(fd, &ttyset) < 0) {
report("nativeStaticGetStopBits: Cannot Get Serial Port Settings\n");
return (-1);
}
switch (ttyset.c_cflag & (CSTOPB)) {
case 0:
return STOPBITS_1;
case CSTOPB:
if (ttyset.c_cflag & CS5) {
return STOPBITS_1_5;
} else {
return STOPBITS_2;
}
default:
return -1;
}
}

/*----------------------------------------------------------
 RXTXPort.nativeGetParityErrorChar

 accept:      -
 perform:     check the ParityErrorChar
 return:      The ParityErrorChar as an jbyte.
 exceptions:  UnsupportedCommOperationException if not implemented
 comments:    It appears the Parity char is usually \0.  The windows
 API allows for this to be changed.  I cant find may
 examples of this being done.  Maybe for a reason.

 Use a direct call to the termios file until we find a
 solution.
 ----------------------------------------------------------*/
JNIEXPORT jbyte JNICALL RXTXPort(nativeGetParityErrorChar)(JNIEnv *env,
jobject jobj) {
unsigned int result = 0;

ENTER( "nativeGetParityErrorChar" );
#ifdef WIN32
result = ( jbyte ) termiosGetParityErrorChar(
get_java_var(env, jobj, "fd", "I" ) );
#else
/*
 arg!  I cant find a way to change it from \0 in Linux.  I think
 the frame and parity error characters are hardcoded.
 */
result = (jint) '\0';

#endif /* WIN32 */
LEAVE( "nativeGetParityErrorChar" );
return ((jbyte) result);
}

/*----------------------------------------------------------
 RXTXPort.nativeGetEndOfInputChar

 accept:      -
 perform:     check the EndOf InputChar
 return:      the EndOfInputChar as an jbyte.  -1 on error
 exceptions:  UnsupportedCommOperationException if not implemented
 comments:
 ----------------------------------------------------------*/
JNIEXPORT jbyte JNICALL RXTXPort(nativeGetEndOfInputChar)(JNIEnv *env,
jobject jobj) {
int fd = get_java_var(env, jobj, "fd", "I");
struct termios ttyset;

ENTER( "nativeGetEndOfInputChar" );
if (tcgetattr(fd, &ttyset) < 0)
goto fail; LEAVE( "nativeGetEndOfInputChar" );
return ((jbyte) ttyset.c_cc[VEOF]);
fail: LEAVE( "nativeGetEndOfInputChar" );
report("nativeGetEndOfInputChar failed\n");
return ((jbyte) - 1);
}

/*----------------------------------------------------------
 RXTXPort.nativeSetParityErrorChar

 accept:      the ParityArrorCharacter as an int.
 perform:     Set the ParityErrorChar
 return:      JNI_TRUE on success
 exceptions:  UnsupportedCommOperationException if not implemented
 comments:    It appears the Parity char is usually \0.  The windows
 API allows for this to be changed.  I cant find may
 examples of this being done.  Maybe for a reason.

 Use a direct call to the termios file until we find a
 solution.
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeSetParityErrorChar)(JNIEnv *env,
jobject jobj, jbyte value) {

#ifdef WIN32
int fd = get_java_var( env, jobj,"fd","I" );
ENTER( "nativeSetParityErrorChar" );
termiosSetParityError( fd, ( char ) value );
LEAVE( "nativeSetParityErrorChar" );
return( JNI_TRUE );
#else
ENTER( "nativeSetParityErrorChar" );
/*
 arg!  I cant find a way to change it from \0 in Linux.  I think
 the frame and parity error characters are hardcoded.
 */

throw_java_exception(env, UNSUPPORTED_COMM_OPERATION, "Not implemented... yet",
strerror( errno));
LEAVE( "nativeSetParityErrorChar" );
return (JNI_FALSE);
#endif /* WIN32 */
}

/*----------------------------------------------------------
 RXTXPort.nativeSetEndOfInputChar

 accept:      The EndOfInputChar as an int
 perform:     set the EndOfInputChar
 return:      JNI_TRUE on success
 exceptions:  UnsupportedCommOperationException if not implemented
 comments:    This may cause troubles on Windows.
 Lets give it a shot and see what happens.

 See termios.c for the windows bits.

 EofChar = val;
 fBinary = false;  winapi docs say always use true. ?
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeSetEndOfInputChar)(JNIEnv *env,
jobject jobj, jbyte value) {
int fd = get_java_var(env, jobj, "fd", "I");
struct termios ttyset;

ENTER( "nativeSetEndOfInputChar" );
if (tcgetattr(fd, &ttyset) < 0)
goto fail;
ttyset.c_cc[VEOF] = (char) value;
if (tcsetattr(fd, TCSANOW, &ttyset) < 0)
goto fail; LEAVE( "nativeSetEndOfInputChar" );
return (JNI_TRUE);
fail: throw_java_exception(env, IO_EXCEPTION, "nativeSetEndOfInputChar",
strerror( errno));
report("nativeSetEndOfInputChar failed\n");
LEAVE( "nativeSetEndOfInputChar" );
return (JNI_FALSE);
}

#ifndef WIN32
long GetTickCount() {
/* return milliseconds */
struct timeval now;

gettimeofday(&now, NULL);
report_verbose("gettimeofday\n");

#ifdef __QNX__
return now.tv_sec * 1000 + now.tv_usec / 1000;
#else
return (now.tv_sec * 1000) + ceil(now.tv_usec / 1000);
#endif /* __QNX__ */
}

#endif /* !WIN32 */

/*----------------------------------------------------------
 read_byte_array

 accept:      int                fd   file descriptor to read from
 unsigned char *buffer   buffer to read data into
 int            length   number of bytes to read
 int           timeout   milliseconds to wait before returning
 perform:     read bytes from the port into a buffer
 return:      status of read
 -1 fail (IOException)
 0 timeout
 >0 number of bytes read
 comments:    According to the Communications API spec, a receive threshold
 of 1 is the same as having the threshold disabled.

 The nuts and bolts are documented in
 NativeEnableReceiveTimeoutThreshold()
 ----------------------------------------------------------*/

int read_byte_array(JNIEnv *env, jobject *jobj, int fd, unsigned char *buffer,
int length, int timeout) {
int ret, left, bytes = 0;
long timeLeft, now = 0, start = 0;
/* char msg[80]; */
struct timeval tv, *tvP;
fd_set rset;
/* TRENT */
int flag, count = 0;
struct event_info_struct *eis = (struct event_info_struct *) get_java_var_long(
env, *jobj, "eis", "J");

report_time_start();
flag = eis->eventflags[SPE_DATA_AVAILABLE];
eis->eventflags[SPE_DATA_AVAILABLE] = 0;
/*
 ENTER( "read_byte_array" );
 sprintf(msg, "read_byte_array requests %i\n", length);
 report( msg );
 */
left = length;
if (timeout >= 0)
start = GetTickCount();
while (bytes < length && count++ < 20) /* && !is_interrupted( eis ) )*/
{
if (timeout >= 0) {
now = GetTickCount();
if (now - start >= timeout) {
eis->eventflags[SPE_DATA_AVAILABLE] = flag;
return bytes;
}
}

FD_ZERO(&rset);
FD_SET(fd, &rset);

if (timeout >= 0) {
timeLeft = timeout - (now - start);
tv.tv_sec = timeLeft / 1000;
tv.tv_usec = 1000 * (timeLeft % 1000);
tvP = &tv;
} else {
tvP = NULL;
}
/* FIXME HERE Trent */
#ifndef WIN32
do {
ret = SELECT(fd + 1, &rset, NULL, NULL, tvP);
} while (ret < 0 && errno == EINTR);
#else
ret = 1;
#endif /* WIN32 */
if (ret == -1) {
report("read_byte_array: select returned -1\n");
LEAVE( "read_byte_array" );
eis->eventflags[SPE_DATA_AVAILABLE] = flag;
return -1;
} else if (ret > 0) {
if ((ret = READ(fd, buffer + bytes, left)) < 0) {
if (errno != EINTR && errno != EAGAIN) {
report("read_byte_array: read returned -1\n");
LEAVE( "read_byte_array" );
eis->eventflags[SPE_DATA_AVAILABLE] = flag;
return -1;
}
eis->eventflags[SPE_DATA_AVAILABLE] = flag;
return -1;
} else if (ret) {
bytes += ret;
left -= ret;
}
/*
 The only thing that is bugging me with the new
 version is the CPU usage when reading on the serial port.  I
 looked at it today and find a quick fix.  It doesn't seems to
 affect the performance for our apps (I mean in a negative way,
 cause the CPU is back to normal, near 0-5%).  All I did is add
 a usleep in the reading function.

 Nicolas <ripley@8d.com>
 */
else {
/* usleep(10); */
usleep(1000);
}
}
}

/*
 if( count > 19 )
 {
 throw_java_exception( env, IO_EXCEPTION, "read_byte_array",
 "No data available" );
 }

 sprintf(msg, "read_byte_array returns %i\n", bytes);
 report( msg );
 LEAVE( "read_byte_array" );
 report_time_end();
 */
eis->eventflags[SPE_DATA_AVAILABLE] = flag;
return bytes;
}

#ifdef asdf
int read_byte_array( JNIEnv *env,
jobject *jobj,
int fd,
unsigned char *buffer,
int length,
int timeout )
{
int ret, left, bytes = 0;
long now, start = 0;
char msg[80];

report_time_start();
ENTER( "read_byte_array" );
sprintf(msg, "read_byte_array requests %i\n", length);
report( msg );
left = length;
if (timeout >= 0)
start = GetTickCount();
while( bytes < length )
{
if (timeout >= 0) {
now = GetTickCount();
if (now-start >= timeout)
return bytes;
}
RETRY: if ((ret = READ( fd, buffer + bytes, left )) < 0 )
{
if (errno == EINTR)
goto RETRY;
report( "read_byte_array: read returned -1\n" );
LEAVE( "read_byte_array" );
return -1;
}
bytes += ret;
left -= ret;
}
sprintf(msg, "read_byte_array returns %i\n", bytes);
report( msg );
LEAVE( "read_byte_array" );
report_time_end();
return bytes;
}

int read_byte_array( JNIEnv *env,
jobject *jobj,
int fd,
unsigned char *buffer,
int length,
int timeout )
{
int ret, left, bytes = 0;
/* int count = 0; */
fd_set rfds;
struct timeval sleep;
struct event_info_struct *eis = find_eis( fd );

#ifndef WIN32
struct timeval *psleep=&sleep;
#endif /* WIN32 */

ENTER( "read_byte_array" );
left = length;
FD_ZERO( &rfds );
FD_SET( fd, &rfds );
if( timeout != 0 )
{
sleep.tv_sec = timeout / 1000;
sleep.tv_usec = 1000 * ( timeout % 1000 );
}
while( bytes < length )
{
/* FIXME: In Linux, select updates the timeout automatically, so
 other OSes will need to update it manually if they want to have
 the same behavior.  For those OSes, timeouts will occur after no
 data AT ALL is received for the timeout duration.  No big deal. */
#ifndef WIN32
do {
if( timeout == 0 ) psleep = NULL;
ret=SELECT( fd + 1, &rfds, NULL, NULL, psleep );
}while (ret < 0 && errno==EINTR);
#else
/*
 the select() needs some work before the above will
 work on win32.  The select code cannot be accessed
 from both the Monitor Thread and the Reading Thread.

 */
ret = RXTXPort(nativeavailable)( env, *jobj );
#endif /* WIN32 */
if( ret == 0 )
{
report( "read_byte_array: select returned 0\n" );
LEAVE( "read_byte_array" );
break;
}
if( ret < 0 )
{
report( "read_byte_array: select returned -1\n" );
LEAVE( "read_byte_array" );
return -1;
}
ret = READ( fd, buffer + bytes, left );
if( ret == 0 )
{
report( "read_byte_array: read returned 0 bytes\n" );
LEAVE( "read_byte_array" );
break;
}
else if( ret < 0 )
{
report( "read_byte_array: read returned -1\n" );
LEAVE( "read_byte_array" );
return -1;
}
bytes += ret;
left -= ret;
}
LEAVE( "read_byte_array" );
return bytes;
}
#endif /* asdf */

/*----------------------------------------------------------
 NativeEnableReceiveTimeoutThreshold
 accept:      int  threshold, int vtime,int buffer
 perform:     Set c_cc->VMIN to threshold and c_cc=>VTIME to vtime
 return:      void
 exceptions:  IOException
 comments:    This is actually all handled in read with select in
 canonical input mode.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(NativeEnableReceiveTimeoutThreshold)(
	JNIEnv *env, jobject jobj, jint vtime, jint threshold, jint buffer)
{
	int fd = get_java_var( env, jobj,"fd","I" );
	struct termios ttyset;
	int timeout;

	if (vtime < 0){
		timeout = 0;
	}
	else if (vtime == 0){
		timeout = 1;
	}
	else{
		timeout = vtime;
	}

	ENTER(
"RXTXPort:NativeEnableRecieveTimeoutThreshold");if( tcgetattr( fd, &ttyset ) < 0 ) goto fail;
	ttyset.c_cc[ VMIN ] = threshold;
	ttyset.c_cc[ VTIME ] = timeout/100;
	if( tcsetattr( fd, TCSANOW, &ttyset ) < 0 ) goto fail;

	LEAVE(
"RXTXPort:NativeEnableRecieveTimeoutThreshold");return;
fail:
	LEAVE(
"RXTXPort:NativeEnableRecieveTimeoutThreshold");
throw_java_exception( env, IO_EXCEPTION, "TimeoutThreshold",
strerror( errno ) );
return;
}

/*----------------------------------------------------------
 RXTXPort.readByte

 accept:      none
 perform:     Read a single byte from the port.  Block unless an exeption
 is thrown, or end of stream.
 return:      The byte read
 exceptions:  IOException
 comments:

 On Fri, 30 Aug 2002, Bill Smith wrote:

 I agree, the documentation isn't the best. No surprises there.

 I did do a test using the sun/win32 comm driver with read() and retrieve
 timeout enabled. It blocked until the timeout expired, then returned a -1.
 This seems to jive with the way I'm reading it which is the javax.comm
 comments regarding read (in the CommPort.getInputStream stuff)
 extends/overrides
 the documentation for java.io.InputStream.

 This is the same behavior that the Windriver driver for vxworks exhibits.

 On Fri, 30 Aug 2002, Bill Smith wrote:

 > Hi Trent,
 >
 > I have a couple of questions/comments.
 >
 > 1) I noticed in the thread last night and in the code changes this morning that you
 >    now have readByte() (which is called from the input stream read(), to block
 >    forever. I pulled the following info from the javax.comm doc for the CommPort class in
 >    getInputStream().
 >
 >    The way I interpret that is that read() just like read(byte[]), and read(byte[], int, int),
 >    show only block indefinitely if timeout is disabled. The sun implementation for win32 (as
 >    well as the one we have for vxworks) returns a -1 when it times out.
 >

 Doing what Sun does is going to the least hassle.  The documentation was a
 little unclear to me.  I assume this is the CommPort.getInputStream
 comment that you mention

 The read behaviour of the input stream returned by getInputStream
 depends on combination of the threshold and timeout values. The
 possible behaviours are described in the table below: ...

 But InputStream is where read(byte) is documented
 http://java.sun.com/j2se/1.3/docs/api/java/io/InputStream.html#read()

 Reads the next byte of data from the input stream. The value byte
 is returned as an int in the range 0 to 255. If no byte is
 available because the end of the stream has been reached, the value
 -1 is returned. This method blocks until input data is
 available, the end of the stream is detected, or an exception is
 thrown

 If you are sure commapi is doing a timeout and returning -1, I can change
 it back and document the issue.

 Because I often grep my own mailbox for details, I'm going to add
 these two comments also:

 public int read(byte[] b)
 )
 http://java.sun.com/j2se/1.3/docs/api/java/io/InputStream.html#read(byte[])

 Reads some number of bytes from the input stream and stores them
 into the buffer array b. The number of bytes actually read is
 returned as an integer. This method blocks until input data is
 available, end of file is detected, or an exception is thrown.

 If b is null, a NullPointerException is thrown. If the length of b
 is zero, then no bytes are read and 0 is returned; otherwise,
 there is an attempt to read at least one byte. If no byte is
 available because the stream is at end of file, the value -1 is
 returned; otherwise, at least one byte is read and stored into b.

 So read(byte[] b) is documented as blocking for the first byte.

 public int read(byte[] b,int off,int len)
 http://java.sun.com/j2se/1.3/docs/api/java/io/InputStream.html#read(byte[],
 int, int)

 Reads up to len bytes of data from the input stream into an array of
 bytes. An attempt is made to read as many as len bytes, but a
 smaller number may be read, possibly zero. The number of bytes
 actually read is returned as an integer.

 Which makes sense with the timeout documentation.

 <snip>threshold comment  I'll look at that next.  I thought those changes
 where in the ifdefed code.  I'll take a second look and reply.

 >
 > Thoughts? Comments?
 >
 > Bill
 >
 > ----------------------
 >
 > public abstract InputStream getInputStream() throws IOException
 >
 >
 > Returns an input stream. This is the only way to receive data from the
 communications
 > port. If the port is unidirectional and doesn't support receiving data, then
 > getInputStream returns null.
 >
 > The read behaviour of the input stream returned by getInputStream depends on
 > combination of the threshold and timeout values. The possible behaviours are
 > described in the table below:
 >
 >
 >    Threshold             Timeout        Read Buffer    Read Behaviour
 > State     Value       State     Value       Size
 >
 -----------------------------------------------------------------------------------
 > disabled    -         disabled    -       n bytes      block until any data is available
 >
 > enabled   m bytes     disabled    -       n bytes      block until min(m,n) bytes are available
 >
 > disabled    -         enabled   x ms      n bytes      block for x ms or
 until any data is available
 >
 > enabled   m bytes     enabled   x ms      n bytes      block for x ms or
 until min(m,n) bytes are available
 >
 > Returns: InputStream object that can be used to read from the port
 >
 > Throws: IOException if an I/O error occurred


 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(readByte)(JNIEnv *env, jobject jobj) {
int bytes;
unsigned char buffer[1];
int fd = get_java_var(env, jobj, "fd", "I");
int timeout = get_java_var(env, jobj, "timeout", "I");
/* char msg[80]; */

/*
 ENTER( "RXTXPort:readByte" );
 report_time_start( );
 */
bytes = read_byte_array(env, &jobj, fd, buffer, 1, timeout);
if (bytes < 0) {
LEAVE( "RXTXPort:readByte" );
throw_java_exception(env, IO_EXCEPTION, "readByte", strerror( errno));
return -1;
}
/*
 LEAVE( "RXTXPort:readByte" );
 sprintf( msg, "readByte return(%i)\n", bytes ? buffer[ 0 ] : -1 );
 report( msg );
 report_time_end( );
 */
return (bytes ? (jint) buffer[0] : -1);
}

/*----------------------------------------------------------
 RXTXPort.readArray

 accept:       offset (offset to start storing data in the jbarray) and
 Length (bytes to read)
 perform:      read bytes from the port into a byte array
 return:       bytes read on success
 0 on read timeout
 exceptions:   IOException
 comments:     throws ArrayIndexOutOfBoundsException if asked to
 read more than SSIZE_MAX bytes
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(readArray)(JNIEnv *env, jobject jobj,
jbyteArray jbarray, jint offset, jint length) {
int bytes;
jbyte *body;
/* char msg[80]; */
int fd = get_java_var(env, jobj, "fd", "I");
int timeout = get_java_var(env, jobj, "timeout", "I");

/*
 ENTER( "readArray" );
 report_time_start( );
 */
if ((size_t) length > SSIZE_MAX || (size_t) length < 0) {
report("RXTXPort:readArray length > SSIZE_MAX");
LEAVE( "RXTXPort:readArray" );
throw_java_exception(env, ARRAY_INDEX_OUT_OF_BOUNDS, "readArray",
"Invalid length");
return -1;
}
body = (*env)->GetByteArrayElements(env, jbarray, 0);
bytes = read_byte_array(env, &jobj, fd, (unsigned char *) (body + offset),
length, timeout);/* dima */
(*env)->ReleaseByteArrayElements(env, jbarray, body, 0);
if (bytes < 0) {
report("RXTXPort:readArray bytes < 0");
LEAVE( "RXTXPort:readArray" );
throw_java_exception(env, IO_EXCEPTION, "readArray", strerror( errno));
return -1;
}
/*
 sprintf( msg, "RXTXPort:readArray: %i %i\n", (int) length, bytes);
 report( msg );
 report_time_end( );
 LEAVE( "RXTXPort:readArray" );
 */
return (bytes);
}

/*----------------------------------------------------------
 RXTXPort.nativeClearCommInput

 accept:       none
 perform:      try to clear the input.
 return:       true on success, false on error
 exceptions:   none
 comments:     This is an extension to commapi.
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXPort(nativeClearCommInput)(JNIEnv *env,
jobject jobj) {
int fd = get_java_var(env, jobj, "fd", "I");
if (tcflush(fd, TCIFLUSH))
return (JNI_FALSE);
return (JNI_TRUE);
}
/*----------------------------------------------------------
 RXTXPort.readTerminatedArray

 accept:       offset (offset to start storing data in the jbarray) and
 Length (bytes to read).  Terminator - 2 bytes that we
 dont read past
 perform:      read bytes from the port into a byte array
 return:       bytes read on success
 0 on read timeout
 exceptions:   IOException
 comments:     throws ArrayIndexOutOfBoundsException if asked to
 read more than SSIZE_MAX bytes
 timeout is not properly handled

 This is an extension to commapi.
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(readTerminatedArray)(JNIEnv *env, jobject jobj,
jbyteArray jbarray, jint offset, jint length, jbyteArray jterminator) {
int bytes, total = 0;
jbyte *body, *terminator;
/* char msg[80]; */
int fd = get_java_var(env, jobj, "fd", "I");
int timeout = get_java_var(env, jobj, "timeout", "I");

/*
 ENTER( "readArray" );
 report_time_start( );
 */
if ((size_t) length > SSIZE_MAX || (size_t) length < 0) {
report("RXTXPort:readArray length > SSIZE_MAX");
LEAVE( "RXTXPort:readArray" );
throw_java_exception(env, ARRAY_INDEX_OUT_OF_BOUNDS, "readArray",
"Invalid length");
return -1;
}
body = (*env)->GetByteArrayElements(env, jbarray, 0);
terminator = (*env)->GetByteArrayElements(env, jterminator, 0);
do {
bytes = read_byte_array(env, &jobj, fd,
(unsigned char *) (body + offset + total), 1, timeout);/* dima */
total += bytes;
if (bytes < 0) {
report("RXTXPort:readArray bytes < 0");
LEAVE( "RXTXPort:readArray" );
throw_java_exception(env, IO_EXCEPTION, "readArray", strerror( errno));
return -1;
}
if (total > 1 && terminator[1] == body[total - 1]
&& terminator[0] == body[total - 2]) {
report("Got terminator!\n");
break;
}

} while (bytes > 0 && total < length);
(*env)->ReleaseByteArrayElements(env, jbarray, body, 0);
/*
 sprintf( msg, "RXTXPort:readArray: %i %i\n", (int) length, bytes);
 report( msg );
 report_time_end( );
 LEAVE( "RXTXPort:readArray" );
 */
return (bytes);
}

/*----------------------------------------------------------
 RXTXPort.nativeavailable

 accept:      none
 perform:     find out the number of bytes available for reading
 return:      available bytes
 -1 on error
 exceptions:  none
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(nativeavailable)(JNIEnv *env, jobject jobj) {
int fd = get_java_var(env, jobj, "fd", "I");
int result;
/*
 char message[80];


 ENTER( "RXTXPort:nativeavailable" );

 On SCO OpenServer FIONREAD always fails for serial devices,
 so try ioctl FIORDCHK instead; will only tell us whether
 bytes are available, not how many, but better than nothing.

 This turns out to be true on Solaris also.  taj.
 */
#ifdef FIORDCHK  /* __unixware__ __sun__ probably others */
result = ioctl(fd, FIORDCHK, 0);
#else
if (ioctl(fd, FIONREAD, &result) < 0) {
goto fail;
}
#endif /* FIORDCHK */
if (result == -1) {
goto fail;
}
/*
 sprintf(message, "    nativeavailable: FIORDCHK result %d, \
		errno %d\n", result , result == -1 ? errno : 0);
 report_verbose( message );
 if( result )
 {
 sprintf(message, "    nativeavailable: FIORDCHK result %d, \
				errno %d\n", result , result == -1 ? errno : 0);
 report( message );
 }
 LEAVE( "RXTXPort:nativeavailable" );
 */
return (jint) result;
fail: report("RXTXPort:nativeavailable:  ioctl() failed\n");
/*
 LEAVE( "RXTXPort:nativeavailable" );
 */
throw_java_exception(env, IO_EXCEPTION, "nativeavailable", strerror( errno));
return (jint) result;
}

/*----------------------------------------------------------
 RXTXPort.setflowcontrol

 accept:      flowmode
 FLOWCONTROL_NONE        none
 FLOWCONTROL_RTSCTS_IN   hardware flow control
 FLOWCONTROL_RTSCTS_OUT         ""
 FLOWCONTROL_XONXOFF_IN  input software flow control
 FLOWCONTROL_XONXOFF_OUT output software flow control
 perform:     set flow control to flowmode
 return:      none
 exceptions:  UnsupportedCommOperationException
 comments:  there is no differentiation between input and output hardware
 flow control
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(setflowcontrol)( JNIEnv *env,
	jobject jobj, jint flowmode )
{
	struct termios ttyset;
	int fd = get_java_var( env, jobj,"fd","I" );

	ENTER("RXTXPort:setflowcontrol");if( tcgetattr( fd, &ttyset ) ) goto fail;

	if ( flowmode & ( FLOWCONTROL_RTSCTS_IN | FLOWCONTROL_RTSCTS_OUT ) )
	{
		ttyset.c_cflag |= HARDWARE_FLOW_CONTROL;
	}
	else ttyset.c_cflag &= ~HARDWARE_FLOW_CONTROL;

	ttyset.c_iflag &= ~IXANY;

	if ( flowmode & FLOWCONTROL_XONXOFF_IN )
	{
		ttyset.c_iflag |= IXOFF;
	}
	else ttyset.c_iflag &= ~IXOFF;

	if ( flowmode & FLOWCONTROL_XONXOFF_OUT )
	{

		ttyset.c_iflag |= IXON;
	}
	else ttyset.c_iflag &= ~IXON;
/* TRENT */
	if( tcsetattr( fd, TCSANOW, &ttyset ) ) goto fail;
	LEAVE(
"RXTXPort:setflowcontrol");return;
fail:
	LEAVE("RXTXPort:setflowcontrol"); throw_java_exception( env, UNSUPPORTED_COMM_OPERATION, "",
"flow control type not supported" );
return;
}

/*----------------------------------------------------------
 unlock_monitor_thread

 accept:      event_info_struct
 perform:     unlock the monitor thread so event notification can start.
 return:      none
 exceptions:  none
 comments:    Events can be missed otherwise.
 ----------------------------------------------------------*/

void unlock_monitor_thread(struct event_info_struct *eis) {
JNIEnv *env = eis->env;
jobject jobj = *(eis->jobj);

jfieldID jfid = (*env)->GetFieldID(env, (*env)->GetObjectClass(env, jobj),
"MonitorThreadLock", "Z");
(*env)->SetBooleanField(env, jobj, jfid, (jboolean) 0);
}

/*----------------------------------------------------------
 check_line_status_register

 accept:      event_info_struct
 perform:     check for changes on the LSR
 return:      0 on success
 exceptions:  none
 comments:    not supported on all devices/drivers.
 ----------------------------------------------------------*/
int check_line_status_register(struct event_info_struct *eis) {
#ifdef TIOCSERGETLSR
struct stat fstatbuf;

if (!eis->eventflags[SPE_OUTPUT_BUFFER_EMPTY]) {
/* This occurs constantly so remove for now
 * report( "check_line_status_registe OUPUT_BUFFER_EMPTY not set\n" );
 */
return 0;
}
if (fstat(eis->fd, &fstatbuf)) {
report("check_line_status_register: fstat\n");
return (1);
}
if (ioctl(eis->fd, TIOCSERGETLSR, &eis->change)) {
report("check_line_status_register: TIOCSERGETLSR\n is nonnull\n");
return (1);
} else if (eis && eis->change) {
report_verbose("check_line_status_register: sending OUTPUT_BUFFER_EMPTY\n");
send_event(eis, SPE_OUTPUT_BUFFER_EMPTY, 1);
}
#else
/*
 printf("test %i\n",  eis->output_buffer_empty_flag );
 */
if( eis && eis->output_buffer_empty_flag == 1 &&
eis->eventflags[SPE_OUTPUT_BUFFER_EMPTY] )
{
report_verbose("check_line_status_register: sending SPE_OUTPUT_BUFFER_EMPTY\n");
send_event( eis, SPE_OUTPUT_BUFFER_EMPTY, 1 );
/*
 send_event( eis, SPE_DATA_AVAILABLE, 1 );
 */
eis->output_buffer_empty_flag = 0;
}
#endif /* TIOCSERGETLSR */
return (0);
}

/*----------------------------------------------------------
 has_line_status_register_access

 accept:      fd of interest
 perform:     check for access to the LSR
 return:      0 if not available
 exceptions:  none
 comments:    not supported on all devices/drivers.
 JK00: work around for multiport cards without TIOCSERGETLSR
 Cyclades is one of those :-(
 ----------------------------------------------------------*/
int has_line_status_register_access(int fd) {
#if defined(TIOCSERGETLSR)
int change;

if (!ioctl(fd, TIOCSERGETLSR, &change)) {
return (1);
}
#endif /* TIOCSERGETLSR */
report("has_line_status_register_acess: Port does not support TIOCSERGETLSR\n");
return (0);
}

/*----------------------------------------------------------
 check_cgi_count

 accept:      fd of interest
 perform:     check for access to TIOCGICOUNT
 return:      0 if not available
 exceptions:  none
 comments:    not supported on all devices/drivers.
 *	wait for RNG, DSR, CD or CTS  but not DataAvailable
 *      The drawback here is it never times out so if someone
 *      reads there will be no chance to try again.
 *      This may make sense if the program does not want to
 *      be notified of data available or errors.
 *	ret=ioctl(fd,TIOCMIWAIT);
 ----------------------------------------------------------*/
void check_cgi_count(struct event_info_struct *eis) {
#if defined(TIOCGICOUNT)

/* JK00: only use it if supported by this port */

struct serial_icounter_struct sis;
memcpy(&sis, &eis->osis, sizeof(struct serial_icounter_struct));

if (ioctl(eis->fd, TIOCGICOUNT, &sis)) {
report("check_cgi_count: TIOCGICOUNT\n is not 0\n");
return;
}
while (eis && sis.frame != eis->osis.frame) {
send_event(eis, SPE_FE, 1);
eis->osis.frame++;
}
while (eis && sis.overrun != eis->osis.overrun) {
send_event(eis, SPE_OE, 1);
eis->osis.overrun++;
}
while (eis && sis.parity != eis->osis.parity) {
send_event(eis, SPE_PE, 1);
eis->osis.parity++;
}
while (eis && sis.brk != eis->osis.brk) {
send_event(eis, SPE_BI, 1);
eis->osis.brk++;
}
if (eis)
memcpy(&eis->osis, &sis, sizeof(struct serial_icounter_struct));
#endif /*  TIOCGICOUNT */
}

/*----------------------------------------------------------
 port_has_changed_fionread

 accept:      fd of interest
 perform:     check if FIONREAD has changed
 return:      0 if no data available
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
int port_has_changed_fionread(struct event_info_struct *eis) {
int change, rc;
char message[80];

rc = ioctl(eis->fd, FIONREAD, &change);
sprintf(message, "port_has_changed_fionread: change is %i ret is %i\n", change,
eis->ret);
#if defined(__unixware__) || defined(__sun__)
/*
 On SCO OpenServer FIONREAD always fails for serial devices,
 so rely upon select() result to know whether data available.

 This is true for Solaris, also.  taj.
 */
if( (rc != -1 && change) || (rc == -1 && eis->ret > 0) )
return( 1 );
#else
sprintf(message, "port_has_changed_fionread: change is %i\n", change);
report_verbose(message);
if (change)
return (1);
#endif /* __unixware__  || __sun__ */
return (0);
}

/*----------------------------------------------------------
 check_tiocmget_changes

 accept:      event_info_struct
 perform:     use TIOCMGET to report events
 return:      none
 exceptions:  none
 comments:    not supported on all devices/drivers.
 ----------------------------------------------------------*/
void check_tiocmget_changes(struct event_info_struct * eis) {
unsigned int mflags = 0;
int change;

/* DORITO */
if (!eis)
return;
change = eis->change;

report_verbose("entering check_tiocmget_changes\n");
if (ioctl(eis->fd, TIOCMGET, &mflags)) {
report("=======================================\n");
report("check_tiocmget_changes: ioctl(TIOCMGET)\n");
return;
}

change = (mflags & TIOCM_CTS) - (eis->omflags & TIOCM_CTS);
if (eis && change)
send_event(eis, SPE_CTS, change);

change = (mflags & TIOCM_DSR) - (eis->omflags & TIOCM_DSR);
if (eis && change) {
report("sending DSR ===========================\n");
send_event(eis, SPE_DSR, change);
}

change = (mflags & TIOCM_RNG) - (eis->omflags & TIOCM_RNG);
if (eis && change)
send_event(eis, SPE_RI, change);

change = (mflags & TIOCM_CD) - (eis->omflags & TIOCM_CD);
if (eis && change)
send_event(eis, SPE_CD, change);

if (eis)
eis->omflags = mflags;
report_verbose("leaving check_tiocmget_changes\n");
}

/*----------------------------------------------------------
 system_wait

 accept:
 perform:
 return:
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
void system_wait() {
#if defined (__sun__ )
struct timespec retspec, tspec;
retspec.tv_sec = 0;
retspec.tv_nsec = 100000000;
do {
tspec = retspec;
nanosleep( &tspec, &retspec );
}while( tspec.tv_nsec != 0 );
/* Trent
 */
#else
#ifdef TRENT_IS_HERE_DEBUGGING_THREADS
/* On NT4 The following was observed in a intense test:
 50000   95%   179 sec
 200000  95%   193 sec
 1000000 95%   203 sec	some callback failures sometimes.
 2000000 0-95% 		callback failures.
 */
#endif /* TRENT_IS_HERE_DEBUGGING_THREADS */
#endif /* __sun__ */
}

/*----------------------------------------------------------
 driver_has_tiocgicount

 accept:      fd of interest
 perform:     check for access to TIOCGICOUNT
 return:      0 if not available
 exceptions:  none
 comments:    not supported on all devices/drivers.
 Some multiport serial cards do not implement TIOCGICOUNT ...
 So use the 'dumb' mode to enable using them after all! JK00
 ----------------------------------------------------------*/
int driver_has_tiocgicount(struct event_info_struct * eis) {
#if defined(TIOCGICOUNT)

/* Some multiport serial cards do not implement TIOCGICOUNT ... */
/* So use the 'dumb' mode to enable using them after all! JK00 */

if (ioctl(eis->fd, TIOCGICOUNT, &eis->osis) < 0) {
report_verbose(
" driver_has_tiocgicount:  Port does not support TIOCGICOUNT events\n");
return (0);
} else
return (1);
#endif /*  TIOCGICOUNT */
return (0);

}

/*----------------------------------------------------------
 report_serial_events

 accept:      event_info_struct
 perform:     send events if they occured
 return:      0 if not available
 exceptions:  none
 comments:    not supported on all devices/drivers.
 ----------------------------------------------------------*/
void report_serial_events(struct event_info_struct *eis) {
/* JK00: work around for Multi IO cards without TIOCSERGETLSR */
/* if( eis->has_tiocsergetlsr ) we have a fix for output empty */
if (check_line_status_register(eis))
return;

if (eis && eis->has_tiocgicount)
check_cgi_count(eis);
#ifndef WIN32 /* something is wrong here */
#endif /* WIN32 */

check_tiocmget_changes(eis);
if (eis && port_has_changed_fionread(eis)) {
if (!eis->eventflags[SPE_DATA_AVAILABLE]) {
report_verbose("report_serial_events: ignoring DATA_AVAILABLE\n");
/*
 report(".");
 */
usleep(20000);
#if !defined(__sun__)
/* FIXME: No time to test on all OS's for production */
usleep(20000);
#endif /* !__sun__ */
return;
}
report("report_serial_events: sending DATA_AVAILABLE\n");
if (!send_event(eis, SPE_DATA_AVAILABLE, 1)) {
/* select wont block */
/* FIXME: No time to test on all OS's for production */
/* REMOVE goes around usleep */
#if !defined(__sun__)
#endif /* !__sun__ */
}
usleep(20000);
}
}

/*----------------------------------------------------------
 initialise_event_info_struct

 accept:      event_info_struct for this thread.
 perform:     initialise or reset the event_info_struct
 return:      1 on success
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
int initialise_event_info_struct(struct event_info_struct *eis) {
int i;
jobject jobj = *eis->jobj;
JNIEnv *env = eis->env;
struct event_info_struct *index = master_index;

if (eis->initialised == 1)
goto end;

#ifdef TIOCGICOUNT
memset(&eis->osis, 0, sizeof(eis->osis));
#endif /* TIOCGICOUNT */

if (index) {
while (index->next) {
index = index->next;
}
index->next = eis;
eis->prev = index;
eis->next = NULL;
} else {
master_index = eis;
master_index->next = NULL;
master_index->prev = NULL;
}

for (i = 0; i < 11; i++)
eis->eventflags[i] = 0;
#if !defined(TIOCSERGETLSR) && !defined(WIN32)
eis->output_buffer_empty_flag = 0;
eis->writing = 0;
#endif /* TIOCSERGETLSR */
eis->eventloop_interrupted = 0;
eis->closing = 0;

eis->fd = get_java_var(env, jobj, "fd", "I");
eis->has_tiocsergetlsr = has_line_status_register_access(eis->fd);
eis->has_tiocgicount = driver_has_tiocgicount(eis);

if (ioctl(eis->fd, TIOCMGET, &eis->omflags) < 0) {
report("initialise_event_info_struct: Port does not support events\n");
}

eis->send_event = (*env)->GetMethodID(env, eis->jclazz, "sendEvent", "(IZ)Z");
if (eis->send_event == NULL)
goto fail;
end:
FD_ZERO(&eis->rfds);
FD_SET(eis->fd, &eis->rfds);
eis->tv_sleep.tv_sec = 0;
eis->tv_sleep.tv_usec = 100 * 1000;
eis->initialised = 1;
return (1);
fail: report_error("initialise_event_info_struct: initialise failed!\n");
finalize_event_info_struct(eis);
return (0);
}

/*----------------------------------------------------------
 finalize_event_info_struct

 accept:      event_info_struct for this thread.
 perform:     free resources
 return:      none
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
void finalize_event_info_struct(struct event_info_struct *eis) {
if (eis->jclazz) {
(*eis->env)->DeleteLocalRef(eis->env, eis->jclazz);
}
if (eis->next && eis->prev) {
eis->prev->next = eis->next;
eis->next->prev = eis->prev;
} else if (eis->next) {
eis->next->prev = NULL;
master_index = eis->next;
} else if (eis->prev)
eis->prev->next = NULL;
else
master_index = NULL;
}

/*----------------------------------------------------------
 RXTXPort.eventLoop

 accept:      none
 perform:     periodically check for SerialPortEvents
 return:      none
 exceptions:  none
 comments:	please keep this function clean.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(eventLoop)( JNIEnv *env, jobject jobj )
{
#ifdef WIN32
	int i = 0;
#endif /* WIN32 */
	struct event_info_struct eis;
	eis.jclazz = (*env)->GetObjectClass( env, jobj );
	eis.env = env;
	eis.jobj = &jobj;
	eis.initialised = 0;

	ENTER("eventLoop\n");if ( !initialise_event_info_struct( &eis ) ) goto end;
	if ( !init_threads( &eis ) ) goto end;
	unlock_monitor_thread( &eis );
	do{
		report_time_eventLoop( );
		do {
			/* nothing goes between this call and select */
			if( eis.closing )
			{
				report("eventLoop: got interrupt\n");
				finalize_threads( &eis );
				finalize_event_info_struct( &eis );
				LEAVE("eventLoop");return;
			}
#ifndef WIN32
			/* report( "." ); */
			do {
				eis.ret = SELECT( eis.fd + 1, &eis.rfds, NULL, NULL,
					&eis.tv_sleep );
			} while (eis.ret < 0 && errno==EINTR);
#else
			/*
			    termios.c:serial_select is instable for some
			    reason

			    polling is not blowing up.
			*/
/*
			usleep(5000);
*/
			eis.ret=1;
			while( i++ < 5 )
			{
				if(eis.eventflags[SPE_DATA_AVAILABLE] )
				{
					if( port_has_changed_fionread( &eis ) )
					{
						send_event( &eis, SPE_DATA_AVAILABLE, 1 );
					}
				}
				usleep(1000);
			}
			i = 0;
#endif /* WIN32 */
		}  while ( eis.ret < 0 && errno == EINTR );
		if( eis.ret >= 0 )
		{
			report_serial_events( &eis );
		}
		initialise_event_info_struct( &eis );
	} while( 1 );
end:
	LEAVE(
"eventLoop:  Bailing!\n");
}

/*----------------------------------------------------------
 RXTXVersion.nativeGetVersion

 accept:      none
 perform:     return the current version
 return:      version
 exceptions:  none
 comments:    This is used to avoid mixing versions of the .jar and
 native library.
 First introduced in rxtx-1.5-9
 Moved from RXTXCommDriver to RXTXVersion in rxtx-2.1-7

 ----------------------------------------------------------*/
JNIEXPORT jstring JNICALL RXTXVersion(nativeGetVersion)(JNIEnv *env,
jclass jclazz) {
return (*env)->NewStringUTF(env, "RXTX-2.2pre2");
}

/*----------------------------------------------------------
 RXTXCommDriver.testRead

 accept:      tty_name The device to be tested
 perform:     test if the device can be read from
 return:      JNI_TRUE if the device can be read from
 exceptions:  none
 comments:    From Wayne Roberts wroberts1@home.com
 check tcget/setattr returns.
 support for non serial ports Trent
 ----------------------------------------------------------*/

JNIEXPORT jboolean JNICALL RXTXCommDriver(testRead)(JNIEnv *env, jobject jobj,
jstring tty_name, jint port_type) {
struct termios ttyset;
char c;
#ifdef TRENT_IS_HERE_DEBUGGING_ENUMERATION
char message[80];
#endif /* TRENT_IS_HERE_DEBUGGING_ENUMERATION */
int fd;
const char *name = (*env)->GetStringUTFChars(env, tty_name, 0);
int ret = JNI_TRUE;
int pid = -1;
/* We opened the file in this thread, use this pid to unlock */
#ifndef WIN32
pid = getpid();
#else
char full_windows_name[80];
#endif /* WIN32 */

ENTER( "RXTXPort:testRead" );
#ifdef TRENT_IS_HERE_DEBUGGING_ENUMERATION
/* vmware lies about which ports are there causing irq conflicts */
/* this is for testing only */
if( !strcmp( name, "COM1" ) || !strcmp( name, "COM2") )
{
printf("%s is good\n",name);
sprintf( message, "testRead: %s is good!\n", name );
report( message );
(*env)->ReleaseStringUTFChars( env, tty_name, name );
return( JNI_TRUE );
}
(*env)->ReleaseStringUTFChars( env, tty_name, name );
return( JNI_FALSE );
#endif /* TRENT_IS_HERE_DEBUGGING_ENUMERATION */
#ifdef WIN32
strcpy( full_windows_name, DEVICEDIR );
strcat( full_windows_name, name );
ret = serial_test((char *) full_windows_name );
(*env)->ReleaseStringUTFChars( env, tty_name, name );
return(ret);
#endif /* WIN32 */

/*
 LOCK is one of three functions defined in SerialImp.h

 uucp_lock		Solaris
 fhs_lock		Linux
 system_does_not_lock	Win32
 */

if ( LOCK(name, pid)) {
(*env)->ReleaseStringUTFChars(env, tty_name, name);
LEAVE( "RXTXPort:testRead no lock" );
return JNI_FALSE;
}

/*
 CLOCAL eliminates open blocking on modem status lines
 -- changed to O_NONBLOCK
 */
do {
fd = OPEN(name, O_RDWR | O_NOCTTY | O_NONBLOCK);
} while (fd < 0 && errno == EINTR);

if (fd < 0) {
report_verbose("testRead() open \"");
report_verbose(name);
report_verbose("\" failed: ");
report_verbose(strerror(errno));
report_verbose("\n");
ret = JNI_FALSE;
goto END;
}

if (port_type == PORT_SERIAL) {
int saved_flags;
struct termios saved_termios;

if (tcgetattr(fd, &ttyset) < 0) {
ret = JNI_FALSE;
goto END;
}

/* save, restore later */
if ((saved_flags = fcntl(fd, F_GETFL)) < 0) {
report("testRead() fcntl(F_GETFL) failed\n");
ret = JNI_FALSE;
goto END;
}

memcpy(&saved_termios, &ttyset, sizeof(struct termios));

if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
report("testRead() fcntl(F_SETFL) failed\n");
ret = JNI_FALSE;
goto END;
}

cfmakeraw(&ttyset);
ttyset.c_cc[VMIN] = ttyset.c_cc[VTIME] = 0;

if (tcsetattr(fd, TCSANOW, &ttyset) < 0) {
report("testRead() tcsetattr failed\n");
ret = JNI_FALSE;
tcsetattr(fd, TCSANOW, &saved_termios);
goto END;
}

/*

 The following may mess up if both EAGAIN and EWOULDBLOCK
 are defined but only EWOULDBLOCK is used

 Linux:

 man 2 open
 O_NONBLOCK or O_NDELAY
 When  possible,  the file is opened in non-blocking
 mode. Neither the open nor  any  subsequent  opera�
 tions on the file descriptor which is returned will
 cause the calling process to wait.   For  the  han�
 dling  of  FIFOs  (named  pipes), see also fifo(4).
 This mode need not have any effect on  files  other
 than FIFOs.

 man 2 read
 EAGAIN
 Non-blocking I/O has been selected using O_NONBLOCK
 and no data was immediately available for  reading.


 /usr/include/asm/error.h:
 #define EAGAIN          11      / Try again /
 #define EWOULDBLOCK     EAGAIN  / Operation would block /

 looks like the kernel is using EAGAIN

 -- should be OK

 Solaris:

 man 2 open
 EAGAIN    The path  argument  names  the  slave  side  of  a
 pseudo-terminal device that is locked.

 man 2 read
 If O_NONBLOCK is set, read() returns -1 and sets errno
 to EAGAIN.

 -- should be OK.

 HP-UX

 both are defined but EAGAIN is used.

 -- should be OK.

 Win32

 neither errno is currently set.  Comment added to termios.c
 serial_open().

 -- should be OK

 Steven's book.  Advanced programming in the Unix Environment pg 364

 "A common use for nonblocking I/O is for dealing with a terminal device
 for a network connection and these devices are normally used by one process
 at a time.  This means that the change in the BSD semantics normally does 't
 effect us.  The different error return, EWOULDBLOCK, instead of POSIX.1
 EAGAIN, continues to be a portability difference that we must deal with."

 */

if ( READ(fd, &c, 1) < 0) {
#ifdef EAGAIN
if ( errno != EAGAIN) {
report("testRead() read failed\n");
ret = JNI_FALSE;
}
#else
#ifdef EWOULDBLOCK
if ( errno != EWOULDBLOCK )
{
report( "testRead() read failed\n" );
ret = JNI_FALSE;
}
#else
ret = JNI_FALSE;
#endif /* EWOULDBLOCK */
#endif /* EAGAIN */
}

/* dont walk over unlocked open devices */
tcsetattr(fd, TCSANOW, &saved_termios);
fcntl(fd, F_SETFL, saved_flags);
}

/*
 UNLOCK is one of three functions defined in SerialImp.h

 uucp_unlock		Solaris
 fhs_unlock		Linux
 system_does_not_unlock	Win32
 */

END:
UNLOCK(name, pid);
(*env)->ReleaseStringUTFChars(env, tty_name, name);
CLOSE(fd);
LEAVE( "RXTXPort:testRead" );
return ret;
}

#if defined(__APPLE__)
/*----------------------------------------------------------
 createSerialIterator()
 accept:
 perform:
 return:
 exceptions:
 comments:
 Code courtesy of Eric Welch at Keyspan, except for the bugs
 which are courtesy of Joseph Goldstone (joseph@lp.com)
 ----------------------------------------------------------*/

kern_return_t
createSerialIterator(io_iterator_t *serialIterator)
{
kern_return_t kernResult;
mach_port_t masterPort;
CFMutableDictionaryRef classesToMatch;
if ((kernResult=IOMasterPort( (int) NULL, &masterPort ) ) != KERN_SUCCESS)
{
printf( "IOMasterPort returned %d\n", kernResult);
return kernResult;
}
if ((classesToMatch = IOServiceMatching(kIOSerialBSDServiceValue)) == NULL)
{
printf( "IOServiceMatching returned NULL\n" );
return kernResult;
}
CFDictionarySetValue(classesToMatch, CFSTR(kIOSerialBSDTypeKey), CFSTR(kIOSerialBSDAllTypes));
kernResult = IOServiceGetMatchingServices(masterPort, classesToMatch, serialIterator);
if (kernResult != KERN_SUCCESS)
{
printf( "IOServiceGetMatchingServices returned %d\n", kernResult);
}
return kernResult;
}

/*----------------------------------------------------------
 getRegistryString()

 accept:
 perform:
 return:
 exceptions:
 comments:
 Code courtesy of Eric Welch at Keyspan, except for the bugs
 which are courtesy of Joseph Goldstone (joseph@lp.com)
 ----------------------------------------------------------*/
char *
getRegistryString(io_object_t sObj, char *propName)
{
static char resultStr[256];
CFTypeRef nameCFstring;
resultStr[0] = 0;
nameCFstring = IORegistryEntryCreateCFProperty(sObj,
CFStringCreateWithCString(kCFAllocatorDefault, propName, kCFStringEncodingASCII),
kCFAllocatorDefault, 0);
if (nameCFstring)
{
CFStringGetCString(nameCFstring, resultStr, sizeof(resultStr), kCFStringEncodingASCII);
CFRelease(nameCFstring);
}
return resultStr;
}

/*----------------------------------------------------------
 registerKnownSerialPorts()
 accept:
 perform:
 return:
 exceptions:
 comments:
 ----------------------------------------------------------*/
int
registerKnownSerialPorts(JNIEnv *env, jobject jobj, jint portType) /* dima */
{
io_iterator_t theSerialIterator;
io_object_t theObject;
int numPorts = 0;/* dima it should initiated */

if (( createSerialIterator( &theSerialIterator ) != KERN_SUCCESS) ||
( ! IOIteratorIsValid( theSerialIterator)))
{
/*  This also happens when no drivers are installed */
report( "createSerialIterator failed\n" );
return(0);
} else {
jclass cls; /* dima */
jmethodID mid; /* dima */
cls = (*env)->FindClass(env,"gnu/io/CommPortIdentifier" ); /* dima */
if (cls == 0) { /* dima */
report( "can't find class of gnu/io/CommPortIdentifier\n" ); /* dima */
return numPorts; /* dima */
} /* dima */
mid = (*env)->GetStaticMethodID(env, cls, "addPortName", "(Ljava/lang/String;ILgnu/io/CommDriver;)V" ); /* dima */

if (mid == 0) {
printf( "getMethodID of CommDriver.addPortName failed\n" );
} else {
while (theObject = IOIteratorNext(theSerialIterator))
{
/* begin dima */
jstring tempJstring;
tempJstring = (*env)->NewStringUTF(env,getRegistryString(theObject, kIODialinDeviceKey));
(*env)->CallStaticVoidMethod(env, cls, mid,tempJstring,portType,jobj);/* dima */
(*env)->DeleteLocalRef(env,tempJstring);
numPorts++;

tempJstring = (*env)->NewStringUTF(env,getRegistryString(theObject, kIOCalloutDeviceKey));
(*env)->CallStaticVoidMethod(env, cls, mid,tempJstring,portType,jobj);/* dima */
(*env)->DeleteLocalRef(env,tempJstring);
numPorts++;
/* end dima */
}
}
}
return numPorts;
}
#endif /* __APPLE__ */

/*----------------------------------------------------------
 registerKnownPorts

 accept:      the type of port
 perform:     register any ports of the desired type a priori known to this OS
 return:      JNI_TRUE if any such ports were registered otherwise JNI_FALSE
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXCommDriver(registerKnownPorts)(JNIEnv *env,
jobject jobj, jint portType) {
enum {
PORT_TYPE_SERIAL = 1,
PORT_TYPE_PARALLEL,
PORT_TYPE_I2C,
PORT_TYPE_RS485,
PORT_TYPE_RAW
};
jboolean result = JNI_FALSE;
char message[80];

switch (portType) {
case PORT_TYPE_SERIAL:
#if defined(__APPLE__)
if (registerKnownSerialPorts(env, jobj,
PORT_TYPE_SERIAL) > 0) {/* dima */
result = JNI_TRUE;
}
#endif
break;
case PORT_TYPE_PARALLEL:
break;
case PORT_TYPE_I2C:
break;
case PORT_TYPE_RS485:
break;
case PORT_TYPE_RAW:
break;
default:
sprintf(message,
"unknown portType %d handed to \
				native RXTXCommDriver.registerKnownPorts() \
				 method.\n",
(int) portType);
report(message);
}
return result;
}

/*----------------------------------------------------------
 isPortPrefixValid

 accept:      a port prefix
 perform:     see if the port prefix matches a port that is valid on this OS.
 return:      JNI_TRUE if it exists otherwise JNI_FALSE
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
JNIEXPORT jboolean JNICALL RXTXCommDriver(isPortPrefixValid)(JNIEnv *env,
jobject jobj, jstring tty_name) {
jboolean result;
static struct stat mystat;
char teststring[256];
int fd, i;
const char *name = (*env)->GetStringUTFChars(env, tty_name, 0);

ENTER( "RXTXCommDriver:isPortPrefixValid" );
for (i = 0; i < 64; i++) {
#if defined(__sun__)
/* Solaris uses /dev/cua/a instead of /dev/cua0 */
if( i > 25 ) break;
sprintf(teststring,"%s%s%c",DEVICEDIR, name, i + 97 );
fprintf(stderr, "testing: %s\n", teststring);
#else
#if defined(_GNU_SOURCE)
snprintf(teststring, 256, "%s%s%i",DEVICEDIR,name, i);
#else
sprintf(teststring, "%s%s%i", DEVICEDIR, name, i);
#endif /* _GNU_SOURCE */
stat(teststring, &mystat);
#endif /* __sun__ */
/* XXX the following hoses freebsd when it tries to open the port later on */
#ifndef __FreeBSD_kernel__
if (S_ISCHR(mystat.st_mode)) {
fd = OPEN(teststring, O_RDONLY | O_NONBLOCK);
if (fd > 0) {
CLOSE(fd);
result = JNI_TRUE;
break;
} else
result = JNI_FALSE;
} else
result = JNI_FALSE;
#else
result=JNI_TRUE;
#endif  /* __FreeBSD __ */
}
#if defined(_GNU_SOURCE)
snprintf(teststring, 256, "%s%s",DEVICEDIR,name);
#else
sprintf(teststring, "%s%s", DEVICEDIR, name);
#endif /* _GNU_SOURCE */
stat(teststring, &mystat);
if (S_ISCHR(mystat.st_mode)) {
fd = OPEN(teststring, O_RDONLY | O_NONBLOCK);
if (fd > 0) {
CLOSE(fd);
result = JNI_TRUE;
}
}
(*env)->ReleaseStringUTFChars(env, tty_name, name);
LEAVE( "RXTXCommDriver:isPortPrefixValid" );
return (result);
}

/*----------------------------------------------------------
 getDeviceDirectory

 accept:
 perform:
 return:      the directory containing the device files
 exceptions:
 comments:    use this to avoid hard coded "/dev/"
 values are in SerialImp.h
 ----------------------------------------------------------*/

JNIEXPORT jstring JNICALL RXTXCommDriver(getDeviceDirectory)(JNIEnv *env,
jobject jobj) {
ENTER( "RXTXCommDriver:getDeviceDirectory" );
return (*env)->NewStringUTF(env, DEVICEDIR); LEAVE( "RXTXCommDriver:getDeviceDirectory" );
}

/*----------------------------------------------------------
 setInputBufferSize

 accept:
 perform:
 return:      none
 exceptions:  none
 comments:    see fopen/fclose/fwrite/fread man pages.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(setInputBufferSize)
(JNIEnv *env,
jobject jobj, jint size )
{
report( "setInputBufferSize is not implemented\n" );
}

/*----------------------------------------------------------
 getIputBufferSize

 accept:
 perform:
 return:      none
 exceptions:  none
 comments:    see fopen/fclose/fwrite/fread man pages.
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(getInputBufferSize)(JNIEnv *env, jobject jobj) {
report("getInputBufferSize is not implemented\n");
return (1);
}

/*----------------------------------------------------------
 setOutputBufferSize

 accept:
 perform:
 return:      none
 exceptions:  none
 comments:    see fopen/fclose/fwrite/fread man pages.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(setOutputBufferSize)
(JNIEnv *env,
jobject jobj, jint size )
{
report( "setOutputBufferSize is not implemented\n" );
}

/*----------------------------------------------------------
 getOutputBufferSize

 accept:
 perform:
 return:      none
 exceptions:  none
 comments:    see fopen/fclose/fwrite/fread man pages.
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL RXTXPort(getOutputBufferSize)(JNIEnv *env, jobject jobj) {
report("getOutputBufferSize is not implemented\n");
return (1);
}

/*----------------------------------------------------------
 interruptEventLoop

 accept:      nothing
 perform:     increment eventloop_interrupted
 return:      nothing
 exceptions:  none
 comments:    all eventloops in this PID will check if their thread
 is interrupted.  When all the interrupted threads exit
 they will decrement the var leaving it 0.
 the remaining threads will continue.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(interruptEventLoop)(JNIEnv *env,
jobject jobj)
{
struct event_info_struct *index = master_index;
int fd = get_java_var( env, jobj, "fd", "I" );
int searching = 1;

while( searching )
{
index = master_index;
if( index )
{
while( index->fd != fd &&
index->next ) index = index->next;
if ( index->fd == fd ) searching = 0;
}
else
report("x");
if( searching )
{
report("@");
usleep(1000);
}
}
index->eventloop_interrupted = 1;
/*
 Many OS's need a thread running to determine if output buffer is
 empty.  For Linux and Win32 it is not needed.  So closing is used to
 shut down the thread in the write order on OS's that don't have
 kernel support for output buffer empty.

 In rxtx TIOCSERGETLSR is defined for win32 and Linux
 */
#ifdef TIOCSERGETLSR
index->closing=1;
#endif /* TIOCSERGETLSR */
#ifdef WIN32
termios_interrupt_event_loop( index->fd, 1 );
#endif /* WIN32 */
#if !defined(TIOCSERGETLSR) && !defined(WIN32)
/* make sure that the drainloop unblocks from tcdrain */
pthread_kill(index->drain_tid, SIGABRT);
/* TODO use wait/join/SIGCHLD/?? instead of sleep? */
usleep(50 * 1000);
/*
 Under normal conditions, SIGABRT will unblock tcdrain. However
 a non-responding USB device combined with an unclean driver
 may still block. This is very ugly because it may block the call
 to close indefinetly.
 */
if (index->closing != 1) {
/* good bye tcdrain, and thanks for all the fish */
report("interruptEventLoop: canceling blocked drain thread\n");
pthread_cancel(index->drain_tid);
index->closing = 1;
}
#endif
report("interruptEventLoop: interrupted\n");
}

/*----------------------------------------------------------
 is_interrupted

 accept:      event_info_struct
 perform:     see if the port is being closed.
 return:      a positive value if the port is being closed.
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
jboolean is_interrupted(struct event_info_struct *eis) {
int result;
JNIEnv *env = eis->env;

ENTER( "is_interrupted" );
(*env)->ExceptionClear(env);
result = (*env)->CallBooleanMethod(env, *eis->jobj, eis->checkMonitorThread);
#ifdef DEBUG
if((*env)->ExceptionOccurred(env)) {
report ( "is_interrupted: an error occured calling sendEvent()\n" );
(*env)->ExceptionDescribe(env);
(*env)->ExceptionClear(env);
}
#endif /* DEBUG */
LEAVE( "RXTXCommDriver:is_interrupted" );
return (result);
}

/*----------------------------------------------------------
 nativeSetEventFlag

 accept:      fd for finding the struct, event to flag, flag.
 perform:     toggle the flag
 return:      none
 exceptions:  none
 comments:	all the logic used to be done in Java but its too noisy
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL RXTXPort(nativeSetEventFlag)( JNIEnv *env,
jobject jobj,
jint fd,
jint event,
jboolean flag )
{
struct event_info_struct *index = master_index;

if( !index )
{
report_error("nativeSetEventFlag !index\n");
return;
}
while( index->fd != fd && index->next )
{
index = index->next;
}
if( index->fd != fd )
{
report_error("nativeSetEventFlag !fd\n");
return;
}
index->eventflags[event] = (int) flag;
#ifdef WIN32
termios_setflags( fd, index->eventflags );
#endif /* win32 */

}

/*----------------------------------------------------------
 send_event

 accept:      event_info_structure, event type and true/false
 perform:     if state is > 0 send a JNI_TRUE event otherwise send JNI_FALSE
 return:      a positive value if the port is being closed.
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
int send_event(struct event_info_struct *eis, jint type, int flag) {
int result;
JNIEnv *env;
if (eis)
env = eis->env;
else
return (-1);

ENTER( "send_event" );
if (!eis || eis->eventloop_interrupted > 1) {
report("event loop interrupted\n");
return JNI_TRUE;
}
report_verbose("send_event: !eventloop_interupted\n");
if (eis->jclazz == NULL)
return JNI_TRUE;
report_verbose("send_event: jclazz\n");

(*env)->ExceptionClear(env);

report_verbose("send_event: calling\n");
result = (*env)->CallBooleanMethod(env, *eis->jobj, eis->send_event, type,
flag > 0 ? JNI_TRUE : JNI_FALSE);
report_verbose("send_event: called\n");

#ifdef asdf
if(!eis || (*eis->env)->ExceptionOccurred(eis->env)) {
report ( "send_event: an error occured calling sendEvent()\n" );
(*eis->env)->ExceptionDescribe(eis->env);
(*eis->env)->ExceptionClear(eis->env);
}
#endif /* asdf */
/* report("e"); */
LEAVE( "send_event" );
return (result);
}

/*----------------------------------------------------------
 get_java_var

 accept:      env (keyhole to java)
 jobj (java RXTXPort object)
 return:      the fd field from the java object
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
size_t get_java_var(JNIEnv *env, jobject jobj, char *id, char *type) {
return (size_t) get_java_var_long(env, jobj, id, type);
}

long get_java_var_long(JNIEnv *env, jobject jobj, char *id, char *type) {
long result = 0;
jclass jclazz = (*env)->GetObjectClass(env, jobj);
jfieldID jfd = (*env)->GetFieldID(env, jclazz, id, type);

/*
 ENTER( "get_java_var" );
 */
if (!jfd) {
(*env)->ExceptionDescribe(env);
(*env)->ExceptionClear(env);
(*env)->DeleteLocalRef(env, jclazz);
LEAVE( "get_java_var" );
return result;
}
if (!strcmp(type, "J")) {
result = (long) ((*env)->GetLongField(env, jobj, jfd));
} else {
result = (size_t) ((*env)->GetIntField(env, jobj, jfd));
}
/* ct7 & gel * Added DeleteLocalRef */
(*env)->DeleteLocalRef(env, jclazz);
if (!strncmp("fd", id, 2) && result == 0)
report_error("get_java_var: invalid file descriptor\n");
/*
 LEAVE( "get_java_var" );
 */
return result;
}

/*----------------------------------------------------------
 throw_java_exception

 accept:      env (keyhole to java)
 *exc (exception class name)
 *foo (function name)
 *msg (error message)
 perform:     Throw a new java exception
 return:      none
 exceptions:  haha!
 comments:
 ----------------------------------------------------------*/
void throw_java_exception(JNIEnv *env, char *exc, char *foo, char *msg) {
char buf[60];
jclass clazz = (*env)->FindClass(env, exc);
ENTER( "throw_java_exception" );
if (!clazz) {
(*env)->ExceptionDescribe(env);
(*env)->ExceptionClear(env);
LEAVE( "throw_java_exception" );
return;
}
#if defined(_GNU_SOURCE)
snprintf( buf, 60, "%s in %s", msg, foo );
#else
sprintf(buf, "%s in %s", msg, foo);
#endif /* _GNU_SOURCE */
(*env)->ThrowNew(env, clazz, buf);
/* ct7 * Added DeleteLocalRef */
(*env)->DeleteLocalRef(env, clazz);
LEAVE( "throw_java_exception" );
}

/*----------------------------------------------------------
 report_warning

 accept:      string to send to report as an message
 perform:     send the string to stderr or however it needs to be reported.
 return:      none
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
void report_warning(const char *msg) {
#ifndef DEBUG_MW
fprintf(stderr, "%s", msg);
#else
mexWarnMsgTxt( (const char *) msg );
#endif /* DEBUG_MW */
}

/*----------------------------------------------------------
 report_verbose

 accept:      string to send to report as an verbose message
 perform:     send the string to stderr or however it needs to be reported.
 return:      none
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
void report_verbose(const char *msg) {
#ifdef DEBUG_VERBOSE
#ifdef DEBUG_MW
mexErrMsgTxt( msg );
#else
fprintf(stderr, "%s", msg);
#endif /* DEBUG_MW */
#endif /* DEBUG_VERBOSE */
}
/*----------------------------------------------------------
 report_error

 accept:      string to send to report as an error
 perform:     send the string to stderr or however it needs to be reported.
 return:      none
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
void report_error(const char *msg) {
#ifndef DEBUG_MW
fprintf(stderr, "%s", msg);
#else
mexWarnMsgTxt( msg );
#endif /* DEBUG_MW */
}

/*----------------------------------------------------------
 report

 accept:      string to send to stderr
 perform:     if DEBUG is defined send the string to stderr.
 return:      none
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
void report(const char *msg) {
#ifdef DEBUG
#	ifndef DEBUG_MW
fprintf(stderr, "%s", msg);
#	else
mexPrintf( msg );
#	endif /* DEBUG_MW */
#endif /* DEBUG */
}

#ifndef WIN32
#ifdef LFS
/*----------------------------------------------------------
 lfs_lock

 accept:      The name of the device to try to lock
 perform:     Create a lock file if there is not one already using a
 lock file server.
 return:      1 on failure 0 on success
 exceptions:  none
 comments:

 ----------------------------------------------------------*/
int lfs_lock( const char *filename, int pid )
{
int s;
int ret;
int size = 1024;
char *buffer = malloc(size);
struct sockaddr_in addr;

if ( !( s = socket( AF_INET, SOCK_STREAM, 0 ) ) > 0 )
return 1;
addr.sin_family = AF_INET;
addr.sin_port = htons( 50001 );
addr.sin_addr.s_addr = inet_addr( "127.0.0.1" );

if ( !connect( s, ( struct sockaddr * ) &addr, sizeof( addr ) ) == 0 )
return 1;
ret=recv( s, buffer, size, 0 );
sprintf( buffer, "lock %s %i\n", filename, pid );
/* printf( "%s", buffer ); */
send( s, buffer, strlen(buffer), 0 );
ret=recv( s, buffer, size, 0 );
if ( ret > 0 )
{
buffer[ret] = '\0';
/* printf( "Message recieved: %s", buffer ); */
}
send( s, "quit\n", strlen( "quit\n" ), 0 );
close(s);
/* printf("%s\n", buffer); */
if( buffer[0] == '2' ) return 0;
return 1;
}

/*----------------------------------------------------------
 lfs_unlock

 accept:      The name of the device to try to unlock
 perform:     Remove a lock file if there is one using a
 lock file server.
 return:      1 on failure 0 on success
 exceptions:  none
 comments:

 ----------------------------------------------------------*/
int lfs_unlock( const char *filename, int pid )
{
int s;
int ret;
int size = 1024;
char *buffer = malloc(size);
struct sockaddr_in addr;

if ( !( s = socket( AF_INET, SOCK_STREAM, 0 ) ) > 0 )
return 1;
addr.sin_family = AF_INET;
addr.sin_port = htons( 50001 );
addr.sin_addr.s_addr = inet_addr( "127.0.0.1" );

if ( !connect( s, ( struct sockaddr * ) &addr, sizeof( addr ) ) == 0 )
return 1;
sprintf( buffer, "unlock %s %i\n", filename, pid );
/* printf( "%s", buffer ); */
send( s, buffer, strlen(buffer), 0 );
ret = recv( s, buffer, size, 0 );
if ( ret > 0 )
{
buffer[ret] = '\0';
/* printf( "Message recieved: %s", buffer ); */
}
send( s, "quit\n", strlen( "quit\n" ), 0 );
close(s);
if( buffer[0] == '2' ) return 0;
return 1;
}
#endif /* LFS */

/*----------------------------------------------------------
 lib_lock_dev_unlock

 accept:      The name of the device to try to unlock
 perform:     Remove a lock file if there is one using a
 lock file server.
 return:      1 on failure 0 on success
 exceptions:  none
 comments:    This is for use with liblockdev which comes with Linux
 distros.  I suspect it will be problematic with embeded
 Linux.   taj

 ----------------------------------------------------------*/
#ifdef LIBLOCKDEV
int lib_lock_dev_unlock( const char *filename, int pid )
{
if( dev_unlock( filename, pid ) )
{
report("fhs_unlock: Unable to remove LockFile\n");
return(1);
}
return(0);
}
#endif /* LIBLOCKDEV */

/*----------------------------------------------------------
 lib_lock_dev_lock

 accept:      The name of the device to try to lock
 termios struct
 perform:     Create a lock file if there is not one already.
 return:      1 on failure 0 on success
 exceptions:  none
 comments:    This is for use with liblockdev which comes with Linux
 distros.  I suspect it will be problematic with embeded
 Linux.   taj

 One could load the library here rather than link it and
 always try to use this.

 ----------------------------------------------------------*/
#ifdef LIBLOCKDEV
int lib_lock_dev_lock( const char *filename, int pid )
{
char message[80];
printf("LOCKING %s\n", filename);
if ( dev_testlock( filename ) )
{
report( "fhs_lock() lockstatus fail\n" );
return 1;
}
if ( dev_lock( filename ) )
{
snprintf( message, 79,
"RXTX fhs_lock() Error: creating lock file for: %s: %s\n",
filename, strerror(errno) );
report_error( message );
return 1;
}
return( 0 );
}
#endif /* LIBLOCKDEV */

/*----------------------------------------------------------
 fhs_lock

 accept:      The name of the device to try to lock
 termios struct
 perform:     Create a lock file if there is not one already.
 return:      1 on failure 0 on success
 exceptions:  none
 comments:    This is for linux and freebsd only currently.  I see SVR4 does
 this differently and there are other proposed changes to the
 Filesystem Hierachy Standard

 more reading:

 ----------------------------------------------------------*/
int fhs_lock(const char *filename, int pid) {
/*
 * There is a zoo of lockdir possibilities
 * Its possible to check for stale processes with most of them.
 * for now we will just check for the lockfile on most
 * Problem lockfiles will be dealt with.  Some may not even be in use.
 *
 */
int fd, j;
char lockinfo[12], message[80];
char file[80], *p;

j = strlen(filename);
p = (char *) filename + j;
/*  FIXME  need to handle subdirectories /dev/cua/...
 SCO Unix use lowercase all the time
 taj
 */
while (*(p - 1) != '/' && j-- != 1) {
#if defined ( __unixware__ )
*p = tolower( *p );
#endif /* __unixware__ */
p--;
}
sprintf(file, "%s/LCK..%s", LOCKDIR, p);
if (check_lock_status(filename)) {
report("fhs_lock() lockstatus fail\n");
return 1;
}
fd = open(file, O_CREAT | O_WRONLY | O_EXCL, 0444);
if (fd < 0) {
snprintf(message, 79, "RXTX fhs_lock() Error: creating lock file: %s: %s\n",
file, strerror(errno));
report_error(message);
return 1;
}
sprintf(lockinfo, "%10d\n", (int) getpid());
sprintf(message, "fhs_lock: creating lockfile: %s\n", lockinfo);
report(message);
write(fd, lockinfo, 11);
close(fd);
return 0;
}

/*----------------------------------------------------------
 uucp_lock

 accept:     char * filename.  Device to be locked
 perform:    Try to get a uucp_lock
 return:     int 0 on success
 exceptions: none
 comments:
 The File System Hierarchy Standard
 http://www.pathname.com/fhs/

 UUCP Lock Files
 http://docs.freebsd.org/info/uucp/uucp.info.UUCP_Lock_Files.html

 FSSTND
 ftp://tsx-11.mit.edu/pub/linux/docs/linux-standards/fsstnd/

 Proposed Changes to the File System Hierarchy Standard
 ftp://scicom.alphacdc.com/pub/linux/devlock-0.X.tgz

 "UNIX Network Programming", W. Richard Stevens,
 Prentice-Hall, 1990, pages 96-101.

 There is much to do here.

 1) UUCP style locks (done)
 /var/spool/uucp
 2) SVR4 locks
 /var/spool/locks
 3) FSSTND locks (done)
 /var/lock
 4) handle stale locks  (done except kermit locks)
 5) handle minicom lockfile contents (FSSTND?)
 "     16929 minicom root\n"  (done)
 6) there are other Lock conventions that use Major and Minor
 numbers...
 7) Stevens recommends LCK..<pid>

 most are caught above.  If they turn out to be problematic
 rather than an exercise, we will handle them.

 ----------------------------------------------------------*/
int uucp_lock(const char *filename, int pid) {
char lockfilename[80], lockinfo[12], message[80];
char name[80];
int fd;
struct stat buf;

sprintf(message, "uucp_lock( %s );\n", filename);
report(message);

if (check_lock_status(filename)) {
report("RXTX uucp check_lock_status true\n");
return 1;
}
if (stat( LOCKDIR, &buf) != 0) {
report("RXTX uucp_lock() could not find lock directory.\n");
return 1;
}
if (stat(filename, &buf) != 0) {
report("RXTX uucp_lock() could not find device.\n");
sprintf(message, "uucp_lock: device was %s\n", name);
report(message);
return 1;
}
sprintf(lockfilename, "%s/LK.%03d.%03d.%03d",
LOCKDIR, (int) major(buf.st_dev), (int) major(buf.st_rdev),
(int) minor(buf.st_rdev));
sprintf(lockinfo, "%10d\n", (int) getpid());
if (stat(lockfilename, &buf) == 0) {
sprintf(message, "RXTX uucp_lock() %s is there\n", lockfilename);
report(message);
report_error(message);
return 1;
}
fd = open(lockfilename, O_CREAT | O_WRONLY | O_EXCL, 0444);
if (fd < 0) {
sprintf(message, "RXTX uucp_lock() Error: creating lock file: %s\n",
lockfilename);
report_error(message);
return 1;
}
write(fd, lockinfo, 11);
close(fd);
return 0;
}

/*----------------------------------------------------------
 check_lock_status

 accept:      the lock name in question
 perform:     Make sure everything is sane
 return:      0 on success
 exceptions:  none
 comments:
 ----------------------------------------------------------*/
int check_lock_status(const char *filename) {
struct stat buf;
/*  First, can we find the directory? */

if (stat( LOCKDIR, &buf) != 0) {
report("check_lock_status: could not find lock directory.\n");
return 1;
}

/*  OK.  Are we able to write to it?  If not lets bail */

if (check_group_uucp()) {
report_error(
"check_lock_status: No permission to create lock file.\nplease see: How can I use Lock Files with rxtx? in INSTALL\n");
return (1);
}

/* is the device alread locked */

if (is_device_locked(filename)) {
report("check_lock_status: device is locked by another application\n");
return 1;
}
return 0;

}

/*----------------------------------------------------------
 fhs_unlock

 accept:      The name of the device to unlock
 perform:     delete the lock file
 return:      none
 exceptions:  none
 comments:    This is for linux only currently.  I see SVR4 does this
 differently and there are other proposed changes to the
 Filesystem Hierachy Standard
 ----------------------------------------------------------*/
void fhs_unlock(const char *filename, int openpid) {
char file[80], *p;
int i;

i = strlen(filename);
p = (char *) filename + i;
/*  FIXME  need to handle subdirectories /dev/cua/... */
while (*(p - 1) != '/' && i-- != 1)
p--;
sprintf(file, "%s/LCK..%s", LOCKDIR, p);

if (!check_lock_pid(file, openpid)) {
unlink(file);
report("fhs_unlock: Removing LockFile\n");
} else {
report("fhs_unlock: Unable to remove LockFile\n");
}
}

/*----------------------------------------------------------
 uucp_unlock

 accept:     char *filename the device that is locked
 perform:    remove the uucp lockfile if it exists
 return:     none
 exceptions: none
 comments:   http://docs.freebsd.org/info/uucp/uucp.info.UUCP_Lock_Files.html
 ----------------------------------------------------------*/
void uucp_unlock(const char *filename, int openpid) {
struct stat buf;
char file[80], message[80];
/* FIXME */

sprintf(message, "uucp_unlock( %s );\n", filename);
report(message);

if (stat(filename, &buf) != 0) {
/* hmm the file is not there? */
report("uucp_unlock() no such device\n");
return;
}
sprintf(file, LOCKDIR"/LK.%03d.%03d.%03d", (int) major(buf.st_dev),
(int) major(buf.st_rdev), (int) minor(buf.st_rdev));
if (stat(file, &buf) != 0) {
/* hmm the file is not there? */
report("uucp_unlock no such lockfile\n");
return;
}
if (!check_lock_pid(file, openpid)) {
sprintf(message, "uucp_unlock: unlinking %s\n", file);
report(message);
unlink(file);
} else {
sprintf(message, "uucp_unlock: unlinking failed %s\n", file);
report(message);
}
}

/*----------------------------------------------------------
 check_lock_pid

 accept:     the name of the lockfile
 perform:    make sure the lock file is ours.
 return:     0 on success
 exceptions: none
 comments:
 ----------------------------------------------------------*/
int check_lock_pid(const char *file, int openpid) {
int fd, lockpid;
char pid_buffer[12];
char message[80];

fd = open(file, O_RDONLY);
if (fd < 0) {
return (1);
}
if (read(fd, pid_buffer, 11) < 0) {
close(fd);
return (1);
}
close(fd);
pid_buffer[11] = '\0';
lockpid = atol(pid_buffer);
/* Native threads JVM's have multiple pids */
if (lockpid != getpid() && lockpid != getppid() && lockpid != openpid) {
sprintf(message, "check_lock_pid: lock = %s pid = %i gpid=%i openpid=%i\n",
pid_buffer, (int) getpid(), (int) getppid(), openpid);
report(message);
return (1);
}
return (0);
}

/*----------------------------------------------------------
 check_group_uucp

 accept:     none
 perform:    check if the user is root or in group uucp
 return:     0 on success
 exceptions: none
 comments:
 This checks if the effective user is in group uucp so we can
 create lock files.  If not we give them a warning and bail.
 If its root we just skip the test.

 if someone really wants to override this they can use the			USER_LOCK_DIRECTORY --not recommended.

 In a recent change RedHat 7.2 decided to use group lock.
 In order to get around this we just check the group id
 of the lock directory.

 * Modified to support Debian *

 The problem was that checking the ownership of the lock file
 dir is not enough, in the sense that even if the current user
 is not in the group of the lock directory if the lock
 directory has 777 permissions the lock file can be anyway
 created.  My solution is simply to try to create a tmp file
 there and if it works then we can go on.  Here is my code that
 I tried and seems to work.

 Villa Valerio <valerio.villa@siemens.com>
 ----------------------------------------------------------*/
int check_group_uucp() {
#ifndef USER_LOCK_DIRECTORY
FILE *testLockFile;
char testLockFileDirName[] = LOCKDIR;
char testLockFileName[] = "tmpXXXXXX";
char *testLockAbsFileName;

testLockAbsFileName = calloc(
strlen(testLockFileDirName) + strlen(testLockFileName) + 2, sizeof(char));
if ( NULL == testLockAbsFileName) {
report_error("check_group_uucp(): Insufficient memory");
return 1;
}
strcat(testLockAbsFileName, testLockFileDirName);
strcat(testLockAbsFileName, "/");
strcat(testLockAbsFileName, testLockFileName);
if ( NULL == mktemp(testLockAbsFileName)) {
free(testLockAbsFileName);
report_error(
"check_group_uucp(): mktemp malformed string - \
			should not happen");

return 1;
}
testLockFile = fopen(testLockAbsFileName, "w+");
if (NULL == testLockFile) {
report_error("check_group_uucp(): error testing lock file "
"creation Error details:");
report_error(strerror(errno));
free(testLockAbsFileName);
return 1;
}

fclose(testLockFile);
unlink(testLockAbsFileName);
free(testLockAbsFileName);

#endif /* USER_LOCK_DIRECTORY */
return 0;

#ifdef USE_OLD_CHECK_GROUP_UUCP
int check_group_uucp()
{
#ifndef USER_LOCK_DIRECTORY
int group_count;
struct passwd *user = getpwuid( geteuid() );
struct stat buf;
char msg[80];
gid_t list[ NGROUPS_MAX ];

if( stat( LOCKDIR, &buf) )
{
sprintf( msg, "check_group_uucp:  Can not find Lock Directory: %s\n", LOCKDIR );
report_error( msg );
return( 1 );
}
group_count = getgroups( NGROUPS_MAX, list );
list[ group_count ] = geteuid();

/* JJO changes start */
if( user == NULL )
{
report_error( "Not able to get user groups.\n" );
return 1;
} else
/* JJO changes stop */

if( user->pw_gid )
{
while( group_count >= 0 && buf.st_gid != list[ group_count ] )
{
group_count--;
}
if( buf.st_gid == list[ group_count ] )
return 0;
sprintf( msg, "%i %i\n", buf.st_gid, list[ group_count ] );
report_error( msg );
report_error( UUCP_ERROR );
return 1;
}
return 0;
/*
 if( strcmp( user->pw_name, "root" ) )
 {
 while( *g->gr_mem )
 {
 if( !strcmp( *g->gr_mem, user->pw_name ) )
 {
 break;
 }
 (void) *g->gr_mem++;
 }
 if( !*g->gr_mem )
 {
 report( UUCP_ERROR );
 return 1;
 }
 }
 */
#endif /* USER_LOCK_DIRECTORY */
return 0;
#endif /* USE_OLD_CHECK_GROUP_UUCP */
}

/*----------------------------------------------------------
 The following should be able to follow symbolic links.  I think the stat
 method used below will work on more systems.  This was found while looking
 for information.

 * realpath() doesn't exist on all of the systems my code has to run
 on (HP-UX 9.x, specifically)
 ----------------------------------------------------------
 int different_from_LOCKDIR(const char* ld)
 {
 char real_ld[MAXPATHLEN];
 char real_LOCKDIR[MAXPATHLEN];
 if (strncmp(ld, LOCKDIR, strlen(ld)) == 0)
 return 0;
 if (realpath(ld, real_ld) == NULL)
 return 1;
 if (realpath(LOCKDIR, real_LOCKDIR) == NULL)
 return 1;
 if (strncmp(real_ld, real_LOCKDIR, strlen(real_ld)) == 0)
 return 0;
 else
 return 1;
 }
 */

/*----------------------------------------------------------
 is_device_locked

 accept:      char * filename.  The device in question including the path.
 perform:     see if one of the many possible lock files is aready there
 if there is a stale lock, remove it.
 return:      1 if the device is locked or somethings wrong.
 0 if its possible to create our own lock file.
 exceptions:  none
 comments:    check if the device is already locked
 ----------------------------------------------------------*/
int is_device_locked(const char *port_filename) {
const char *lockdirs[] = { "/etc/locks", "/usr/spool/kermit",
"/usr/spool/locks", "/usr/spool/uucp", "/usr/spool/uucp/",
"/usr/spool/uucp/LCK", "/var/lock", "/var/lock/modem", "/var/spool/lock",
"/var/spool/locks", "/var/spool/uucp",
LOCKDIR, NULL };
const char *lockprefixes[] = { "LCK..", "lk..", "LK.", NULL };
char *p, *file, pid_buffer[20], *message;
int i = 0, j, k, fd, pid;
struct stat buf, buf2, lockbuf;

j = strlen(port_filename);
p = (char *) port_filename + j;
while (*(p - 1) != '/' && j-- != 1)
p--;

stat(LOCKDIR, &lockbuf);

while (lockdirs[i]) {
/*
 Look for lockfiles in all known places other than the
 defined lock directory for this system
 report any unexpected lockfiles.

 Is the suspect lockdir there?
 if it is there is it not the expected lock dir?
 */
if (!stat(lockdirs[i], &buf2) && buf2.st_ino != lockbuf.st_ino
&& strncmp(lockdirs[i], LOCKDIR, strlen(lockdirs[i]))) {
j = strlen(port_filename);
p = (char *) port_filename + j;
/*
 SCO Unix use lowercase all the time
 taj
 */
while (*(p - 1) != '/' && j-- != 1) {
#if defined ( __unixware__ )
*p = tolower( *p );
#endif /* __unixware__ */
p--;
}
k = 0;
while (lockprefixes[k]) {
/* FHS style */
asprintf(&file, "%s/%s%s", lockdirs[i], lockprefixes[k], p);
if (stat(file, &buf) == 0) {
asprintf(&message, UNEXPECTED_LOCK_FILE, file);
report_warning(message);
free(message);
free(file);
return 1;
}
free(file);

/* UUCP style */
stat(port_filename, &buf);
asprintf(&file, "%s/%s%03d.%03d.%03d", lockdirs[i], lockprefixes[k],
(int) major(buf.st_dev), (int) major(buf.st_rdev), (int) minor(buf.st_rdev));
if (stat(file, &buf) == 0) {
asprintf(&message, UNEXPECTED_LOCK_FILE, file);
report_warning(message);
free(message);
free(file);
return 1;
}
free(file);
k++;
}
}
i++;
}

/*
 OK.  We think there are no unexpect lock files for this device
 Lets see if there any stale lock files that need to be
 removed.
 */

#ifdef FHS
/*  FHS standard locks */
i = strlen(port_filename);
p = (char *) port_filename + i;
while (*(p - 1) != '/' && i-- != 1) {
#if defined ( __unixware__ )
*p = tolower( *p );
#endif /* __unixware__ */
p--;
}
asprintf(&file, "%s/%s%s", LOCKDIR, LOCKFILEPREFIX, p);
#else
/*  UUCP standard locks */
if ( stat( port_filename, &buf ) != 0 )
{
report( "RXTX is_device_locked() could not find device.\n" );
return 1;
}
asprintf( &file, "%s/LK.%03d.%03d.%03d",
LOCKDIR,
(int) major( buf.st_dev ),
(int) major( buf.st_rdev ),
(int) minor( buf.st_rdev )
);

#endif /* FHS */

if (stat(file, &buf) == 0) {

/* check if its a stale lock */
fd = open(file, O_RDONLY);
read(fd, pid_buffer, 11);
/* FIXME null terminiate pid_buffer? need to check in Solaris */
close(fd);
sscanf(pid_buffer, "%d", &pid);

if (kill((pid_t) pid, 0) && errno == ESRCH) {
if (unlink(file) != 0) {
asprintf(&message, "RXTX Error:  Unable to \
					remove stale lock file: %s\n",
file);
report_warning(message);
free(message);
free(file);
return 1;
}
}
}
free(file);
return 0;
}
#endif /* WIN32 */

/*----------------------------------------------------------
 system_does_not_lock

 accept:      the filename the system thinks should be locked.
 perform:     avoid trying to create lock files on systems that dont use them
 return:      0 for success ;)
 exceptions:  none
 comments:    OS's like Win32 may not have lock files.
 ----------------------------------------------------------*/
int system_does_not_lock(const char * filename, int pid) {
return 0;
}

/*----------------------------------------------------------
 system_does_not_unlock

 accept:      the filename the system thinks should be locked.
 perform:     avoid trying to create lock files on systems that dont use them
 return:      none
 exceptions:  none
 comments:    OS's like Win32 may not have lock files.
 ----------------------------------------------------------*/
void system_does_not_unlock(const char * filename, int openpid) {
return;
}

/*----------------------------------------------------------
 dump_termios

 accept:      string to indicate where this was called.
 termios struct
 perform:     print the termios struct to stderr.
 return:      none
 exceptions:  none
 comments:    used to debug the termios struct.
 ----------------------------------------------------------*/
void dump_termios(char *foo, struct termios *ttyset) {
#ifdef DEBUG
int i;

fprintf(stderr, "%s c_iflag=%#x\n", foo, ttyset->c_iflag);
fprintf(stderr, "%s c_lflag=%#x\n", foo, ttyset->c_lflag);
fprintf(stderr, "%s c_oflag=%#x\n", foo, ttyset->c_oflag);
fprintf(stderr, "%s c_cflag=%#x\n", foo, ttyset->c_cflag);
fprintf(stderr, "%s c_cc[]: ", foo);
for(i=0; i<NCCS; i++)
{
fprintf(stderr,"%d=%x ", i, ttyset->c_cc[i]);
}
fprintf(stderr,"\n" );
#endif /* DEBUG */
}

/*----------------------------------------------------------
 get_java_environment

 accept:      pointer to the virtual machine
 flag to know if we are attached
 return:      pointer to the Java Environment
 exceptions:  none
 comments:    see JNI_OnLoad.  For getting the JNIEnv in the thread
 used to monitor for output buffer empty.
 ----------------------------------------------------------*/
JNIEnv *get_java_environment(JavaVM *java_vm, jboolean *was_attached) {
void **env = NULL;
jint err_get_env;
if (java_vm == NULL)
return (JNIEnv *) *env;
*was_attached = JNI_FALSE;

err_get_env = (*java_vm)->GetEnv(java_vm, env, JNI_VERSION_1_2);
if (err_get_env == JNI_ERR)
return NULL;
if (err_get_env == JNI_EDETACHED) {
(*java_vm)->AttachCurrentThread(java_vm, env, (void **) NULL);
if (*env != NULL)
*was_attached = JNI_TRUE;
} else if (err_get_env != JNI_OK)
return (JNIEnv *) NULL;
return (JNIEnv *) *env;
}

/*----------------------------------------------------------
 JNI_OnLoad

 accept:      JavaVM pointer to the Vertial Machine
 void * reserved ???
 return:      jint JNI version used.
 exceptions:  none
 comments:    http://java.sun.com/j2se/1.4.2/docs/guide/jni/jni-14.html
 http://java.sun.com/j2se/1.4.2/docs/guide/jni/jni-12.html
 grab the Java VM pointer when the library loads for later use
 in the drain thread.  Also lets Java know we are using the
 1.4 API so we can get pointers later.
 ----------------------------------------------------------*/
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *java_vm, void *reserved) {
javaVM = java_vm;
report_verbose("JNI_OnLoad called.\n");
return JNI_VERSION_1_2; /* JNI API used */
}

/*----------------------------------------------------------
 JNI_OnUnload

 accept:      JavaVM pointer to the Vertial Machine
 void * reserved ???
 return:      none
 exceptions:  none
 comments:    http://java.sun.com/j2se/1.4.2/docs/guide/jni/jni-14.html
 http://java.sun.com/j2se/1.4.2/docs/guide/jni/jni-12.html
 final library cleanup here.
 ----------------------------------------------------------*/
JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *vm, void *reserved)
{
/* never called it appears */
printf("Experimental:  JNI_OnUnload called.\n");
}

#ifdef asdf
/*----------------------------------------------------------
 printj

 accept:      like vwprintf()
 return:      number of jchars written or -1
 exceptions:  none
 comments:    prints data using System.out.print()
 ----------------------------------------------------------*/
int printj(JNIEnv *env, wchar_t *fmt, ...)
{
wchar_t buf[1024];
int retval;
jstring jsBuf;
jclass clsSystem, clsOut;
jfieldID jfid;
jobject objOut;
jmethodID midPrint;

va_list ap;
va_start(ap, fmt);
retval = _vsnwprintf(buf, 1024, fmt, ap);
va_end(ap);
buf[1023] = '\0';

if((clsSystem = env->FindClass("java/lang/System")) == NULL)
{
IF_DEBUG
(
env->ExceptionDescribe();
)
env->ExceptionClear();
return -1;
}

if( ( jfid = env->GetStaticFieldID(clsSystem,
"out", "Ljava/io/PrintStream;" ) ) == NULL )
{
IF_DEBUG
(
env->ExceptionDescribe();
)
env->ExceptionClear();
env->DeleteLocalRef(clsSystem);
return -1;
}

objOut = env->GetStaticObjectField(clsSystem, jfid);
clsOut = env->GetObjectClass(objOut);

if( ( midPrint = env->GetMethodID(clsOut, "print",
"(Ljava/lang/String;)V" ) ) == NULL )
{
IF_DEBUG
(
env->ExceptionDescribe();
)
env->ExceptionClear();
env->DeleteLocalRef(clsOut);
env->DeleteLocalRef(clsSystem);
return -1;
}

jsBuf = env->NewString(buf, wcslen(buf));

env->CallVoidMethod(objOut, midPrint, jsBuf);

env->DeleteLocalRef(jsBuf);
env->DeleteLocalRef(clsOut);
env->DeleteLocalRef(clsSystem);

return retval;
}
/*
 jclass cls = ( *env )->FindClass( env, "System.Thread" );
 jmethodID mid = ( *env )->GetStaticMethodID( env, cls, "Sleep", "(I)V" );
 (*env)->CallStaticVoidMethod(env, cls, mid, 1);
 */
#endif /* asdf */

